Dragon Link is a powerful combo deck that aims to go first and set up disruption, but can also OTK going second through its easy access to Borrelsword Dragon. It excels at playing through your opponent's disruption through the use of chain blocking. Your main starters are Black Metal Dragon, Starliege Seyfert, and Chaos Space. These cards can give you access to additional monsters while chain blocking your most important effects. For instance, if you have Black Metal Dragon and a Rokket monster in hand, you can use Black Metal Dragon to link summon Striker Dragon. Then, since both monsters' effects activate at the same time, you can decide what order they will occur in the chain. Your opponent will only be able to respond to the last card activated in the chain. By making Striker Dragon chain link 1 and Black Metal Dragon chain link 2, your opponent cannot use a card like Ash Blossom to negate your Striker Dragon's effect. Therefore, you can successfully add Boot Sector Launch and use it to summon the Rokket monster from hand. To play through interruption optimally, you will have to decide which effects to chain block based on what cards you have in hand and what situation you are in. Here are a few basic combos you can go through.
#1 Black Metal Dragon
Normal Summon Black Metal Dragon > Link Summon Striker Dragon > Activate Both Effects To Search Boot Sector Launch And Red-Eyes Darkness Metal Dragon(RedMD) > Banish Striker Dragon To Special Summon RedMD > Activate RedMD's Effect To Special Summon Black Metal Dragon From Grave > Use RedMD And Black Metal Dragon To Link Summon Dragunity Knight Romulus And Activate The Effects Of Romulus And Black Metal Dragon To Add Dragon Ravine And Another RedMD > Activate Dragon Ravine And Discard 1 Card To Activate Its Effect To Send Absorouter Dragon To Grave > Activate Absorouter's Effect To Add Rokket Tracer > Activate Boot Sector Launch And Use Its Effect To Special Summon Rokket Tracer > Activate Rokket Tracer's Effect To Destroy Romulus And Special Summon Rokket Recharger Or Silverrokket From Deck > Synchro Summon Borreload Savage Dragon And Use Its Effect To Equip Romulus
#2 Chaos Space + 1 Dark Monster
Activate Chaos Space And Send A Dark From Hand To Grave To Search White Dragon Wyverburster > Banish The Dark Monster From Grave To Summon Wyverburster > Link Summon Striker Dragon And Activate Both Effects To Search Boot Sector And Black Dragon Collapserpent > Banish Wyverburster To Summon Collapserpent > At This Point You Can Activate The Effect Of Chaos Space In Grave To Place Wyverburster On The Bottom Of Your Deck And Draw 1 Card > Use Striker Dragon And Collapserpent To Link Summon Romulus And Activate The Effects Of Romulus And Collapserpent To Search Dragon Ravine And Wyverburster > Activate Dragon Ravine And Use Its Effect To Discard Wyverburster, Or Any Card In Hand That You Don't Need Or That You Want In Grave, And Send Absorouter To Grave > Activate Absorouter To Search Rokket Tracer > Activate Boot Sector Launch And Use Its Effect To Special Summon Rokket Tracer From Hand > Use Tracer's Effect To Destroy Romulus And Special Summon A Level 4 Rokket From Deck > Synchro Summon Borreload Savage Dragon And Equip Romulus
*this can also be performed by using a light monster with chaos space to search collapserpent first
*also note that this is performed without the use of your normal summon **you could also perform this combo with only starliege seyfert and 1 discard by using seyfert to search collapserpent, but it would use your normal summon and wouldn't get you the draw
#3 Black Metal Dragon + Noctovision Dragon + 1 Rokket Monster
Normal Summon Black Metal Dragon > Link Summon Striker Dragon > Activate The Effects Of Striker Dragon, Black Metal Dragon, And Noctovision Dragon To Search Boot Sector Launch, Search Red-Eyes Darkness Metal Dragon, And Special Summon Noctovision From Hand > Banish Striker Dragon To Special Summon RedMD > Use RedMD's Effect To Special Summon Black Metal Dragon From Grave > Use Noctovision And Black Metal Dragon To Link Summon Romulus And Use The Effects Of Romulus, Black Metal Dragon, And Noctovision To Search Dragon Ravine, Search Another RedMD, And Draw 1 Card > Use RedMD And Romulus To Link Summon Hieratic Seal Of The Heavenly Spheres > Activate Dragon Ravine And Use Its Effect To Discard 1 And Send Absorouter To Grave > Activate Absorouter To Add Tracer Or Another Level 4 Rokket If Tracer Is Already In Hand > Activate Boot Sector And Use Its Effect To Special Summon Tracer And The Other Rokket Monster From Hand > Activate Tracer To Destroy Boot Sector And Special Summon Rokket Synchron From Deck > Use Tracer And The Level 4 Rokket To Synchro Summon Chaos Ruler, The Chaotic Magical Dragon And Use Its Effect To Excavate 5 And Add 1 Light Or Dark Monster Excavated To Hand Then Send The Remaining Cards To Grave (this Can Give You Access To Extra Monsters To Extend With, Thin Your Deck, And Setup Your Graveyard For Future Plays) > Use Chaos Ruler, The Chaotic Magical Dragon And Rokket Synchron To Synchro Summon Hot Red Dragon Archfiend Abyss
#4 Black Metal Dragon + Quick Launch + 1 Rokket Monster
Normal Summon Black Metal Dragon > Link Summon Striker Dragon > Activate Both Effects To Search Boot Sector Launch And Red-Eyes Darkness Metal Dragon > Banish Striker Dragon To Special Summon RedMD > Activate RedMD's Effect To Special Summon Black Metal Dragon From Graveyard > Use RedMD And Black Metal Dragon To Link Summon Hieratic Seal Of The Heavenly Spheres > Activate Black Metal Dragon To Search Another RedMD > Activate Boot Sector And Use Its Effect To Special Summon The Rokket Monster From Hand > Activate Quick Launch To Special Summon A Rokket Monster From Deck (if You Don't Yet Have Tracer, You Will Want To Summon It Here) > Use Tracer's Effect To Destroy Boot Sector And Summon Rokket Synchron From Deck (if You Started With Synchron In Hand, You Will Summon A Level 4 Rokket Here Instead) > Synchro Summon Chaos Ruler, The Chaotic Magical Dragon And Use Its Effect > Synchro Summon Hot Red Dragon Archfiend Abyss
#5 Black Metal Dragon + White Dragon Wyverburster + Rokket Tracer + Rokket Recharger
Normal Summon Black Metal Dragon > Link Summon Striker Dragon > Activate Both Effects To Search Boot Sector Launch And Red-Eyes Darkness Metal Dragon > Banish Black Metal Dragon To Summon Wyverburster > Use Striker Dragon And Wyverburster To Link Summon Hieratic Seal Of The Heavenly Spheres > Activate Wyverburster To Add Collapserpent > Banish Wyverburster To Summon Collapserpent > Use Collapserpent To Link Summon Another Striker Dragon And Place It In The Zone That Spheres Bottom Right Link Arrow Points To > Activate Collapserpent To Add Wyverburster > Activate Boot Sector And Use Its Effect To Special Summon Tracer And Recharger From Hand > Use Tracer To Link Summon Guardragon Pisty In The Zone That Spheres Bottom Left Link Arrow Points To > At This Point You Will Have Striker Dragon And Pisty Positioned To Both Point At The Same Zone, So You Can Use Pisty's Effect To Special Summon Tracer From Grave To That Zone > Banish Striker Dragon To Summon RedMD > Use RedMD To Summon The Striker Dragon That Is In Grave > Use RedMD, Striker Dragon, Pisty, And Recharger To Link Summon Saryuja And Activate Its Effect To Draw 4 Cards Then Return 3 Cards From Your Hand To The Bottom Of The Deck (by This Point You Will Have Thinned Out Your Deck A Good Bit So You Can Find Hand Traps And Board Breakers, And Setup Your Hand For Future Turns) > From Here You Can Use Tracer's Effect To Destroy Saryuja And Special Summon A Recharger Or Silverrokket From Deck > Synchro Summon Borreload Savage Dragon And Equip Saryuja
These combos outlined should give you a basic idea of how the deck is played. Throughout your turn, you will ideally gain access to even more plays through the cards you draw and excavate. As you get more familiar with the deck, you will see many other combo lines that you can go through. The usual end board is spheres + hot red dragon archfiend abyss, spheres + borreload savage dragon, or sometimes all 3. Spheres functions as both disruption and a way to search levianeer by summoning brotaur off its second effect. By this point you will have already filled your graveyard with the necessary requirements to summon it when your opponent passes turn. It can then be used to help break the board they set up if they managed to play through your disruption.
Some things to keep in mind:
*Rokket Tracer's effect will lock you into summoning dark monsters from the extra deck for the rest of the turn.
*Rokket Synchron's effect will lock you into summoning dark monsters from the extra deck for the rest of the turn.
*Black Metal Dragon is not once per turn.
*Hieratic Seal of the Heavenly Spheres can only activate its effect to return a card to hand while in an extra monster zone.
*When tributing itself for cost, Hieratic Seal of the Heavenly Spheres can resolve its effect to return a card to hand while under skill drain, because it won't be on the field during resolution.
*Hieratic Seal of the Heavenly Spheres does not target. You will choose which face-up card to return to hand when resolving its effect.
*Nibiru will trigger Hieratic Seal of the Heavenly Spheres effect to special summon a dragon from deck.
*Rokket Tracer's effect is a quick effect, so you can chain it to the activation of one of your spell cards, and destroy that spell card, to get both effects without having to sacrifice an additional resource.
*White Dragon Wyverburster and Black Dragon Collapserpent's effect to special summon themselves from hand is once per turn, but their effect to add each other is not.