OjaABC +Explanation

Ojama ABC going second deck.

START/COMBO

1. Standby Phase - Play Forbidden Droplet. Ideally, you wanna discard Ojamagic, but anyone normal Ojamas, ABC, XYZ, and Armed Dragon LV3 are fine.  
2. Main Phase 1 - Summon Ojama Blue by Rescue Cat, Ojamatch, or Normal Summoning Ojama Blue.
3. Battle Phase - Run your Ojama Blue into your enemy. Grab Ojamatch and Ojamagic. Play Ojamatch for Ojama Blue and repeat until you have at least 6 Ojamas in your hand, field, or graveyard, and 2X Ojamassimilation. 
4. Main Phase 2 - Use Ojamassimilation and target ABC-Dragon Buster. Use ABC to Summon Saryuja Skull Dread. Use the second Ojamassimilation to target XYZ-Dragon Cannon. Use XYZ to Summon XYZ-Dragon Cannon. Special Summon ABC-Dragon Buster from your extra deck with its effect. Sacrifice XYZ-Dragon Cannon and ABC-Dragon Buster to summon A-to-Z-Dragon Buster Cannon.
5. End Phase - Just end. you have a 4000 attack, unlimited omni negate card that can finish the game next turn by attacking 6 times*.

EXTRA

Throughout the Combo, you can pop your opponent's cards, with ABC-Dragon Buster and nightmares if you choose to not play Saryuja Skull Dread.

Ideally, you want 1 extra monster alive after the battle phase so Saryuja Skull Dread can get the link 4 effect and reset your hand.

When the ABC cards are sent to the graveyard, their float effects will trigger giving you potentially extra value.

Tech cards

1. Prohibition - used for hand traps mainly but can be useful against other tech cards like Nibiru, the Primal Being and Gameciel, the Sea Turtle Kaiju 
2. Draws. Upstart Goblin, One Day of Peace, Pot of Prosperity You can replace them with alternatives.
3. XYZs- Both Sky Cavalry Centaurea and Number 64: Ronin Raccoon Sandayu is used if all else fails and you really want to still play the game. Divine Arsenal AA-ZEUS - Sky Thunder - honestly a very niche situational card. used with Sky Cavalry Centaurea and Number 64: Ronin Raccoon Sandayu.
4. Nightmares- Situationally good if you don't have board answers. Knightmare Phoenix for back row, Knightmare Cerberus for boss Monsters, and Knightmare Unicorn for everything else. 
5. Link Spider- Only used for Nightmare co-link or extra link value at main phase 2.
6. Apollousa, Bow of the Goddess - Strong Card in General. used instead of Saryuja Skull Dread if you want extra protection against Nibiru, the Primal Being 
7. Bujinki Ahashima - used just before Sky Cavalry Centaurea and Number 64: Ronin Raccoon Sandayu for extra value in a lost game.

Side Deck

1. Nibiru, the Primal Being - Strong Going Second card in General. typically used in matchups where you struggle to break the board with only Forbidden Droplet 
2. Ojama Pink - decent going first card. Against swarm decks that need all their monster zones, this can block a lot of combos. Good with Ojamagic.
3. Zombie World - Niche but important going first card. Game-breaking for decks that require one type like D/D/D and Sword Soul.
4. Lightning Storm - Against people who still use back roll. going second card.
5. Triple Tactics Talent - Versatile card that behaves similarly to Called by the Grave and Prohibition. Used for matchups that you can't win. (Check Common Questions).

Common Questions.

Winning

Unlikely. This is more of a rouge/non-meta/fun deck at best. Is it possible to win against the current meta decks? Yes. But is it probable? No. The current Yugioh Meta game is fast and lockdown-heavy. If you go first with this deck you will die before your second turn. If you go second, you have to board clear omni negates, spells, traps, and hand-traps. Against a lot of meta decks, it's less so about you getting lucky to win but your opponent getting unlucky for you to have a chance to get lucky and win.

Counters

Dark Ruler No More - It is the single best counter to this deck. if your opponent plays this card after your A-to-Z-Dragon Buster Cannon, you have lost there is no real way around it outside of Prohibition and praying.

Gameciel, the Sea Turtle Kaiju, Lava Golem, The Winged Dragon of Ra - Sphere Mode, etc - the latter can be countered by having only A-to-Z-Dragon Buster Cannon, but Gameciel, the Sea Turtle Kaiju is death without Prohibition.

Prohibition

Prohibition is your only out in a lot of situations, but it is hard to play. You have to know what your opponent is playing, what they have in hand right now, you have to draw it and it is vulnerable. the ideal targets are Fairy Tail - Snow, Dark Ruler No More, and Gameciel, the Sea Turtle Kaiju.

Hand Traps

I don't particularly like hand traps, but ethics aside, you don't really need it in this deck. The entire purpose of this deck is to bring out A-to-Z-Dragon Buster Cannon. Stopping your opponent doesn't further the goal, it just makes it easier. Putting in cards like Effect Veiler, Fairy Tail - Snow, or Infinite Impermanence means taking out Forbidden Droplet or Prohibition, cards that are more important in the deck.

Author's note

I always liked Ojamas. I think they are goofy and beating your opponent with 2-star normal monsters is very satisfying. realistically this deck is probably trash, but I would appreciate any opinions, advice, and ideas to make it better.

Thank you for taking your time and reading this soup of words.

Don't be too jealous