The main goal of this deck is to simply get as many monsters on the field to go into easy link summons with the Predaplant engine and all the WATER Nimble monsters,
Nimble Angler being your main play maker. The whole Extra Deck lineup is there to make your opponent go minus with
Akashic Magician and
Thousand-Eyes Restrict and to protect yourself and block your opponent with all the Knightmares,
Tri-Gate Wizard and the occational
Toadally Awesome that can pop out backrow and make you go even in card economy by special summoning another Frog from the GY.
Knightmare Unicorn in here mainly to make you extend your plays by drawing 3 cards in one Draw Phase and then goes to the GY to swap onto a
Knightmare Gryphon.
Binary Sorceress is there if you want to extand your plays but can't go immediatly into a link 3 and her effect can allow you to destroy powerful monsters with weal Knightmare monsters of yours.
The safest early play is to go into
Knightmare Phenix +
Knightmare Cerberus if you can't manage to get more on the field during your first turn to avoid destruction effect and being run over by monsters during the Battle Phase at the same time, to safely extend your plays on your next turn. Don't be afraid to send your link monsters to the GY as you can get them back with
Knightmare Corruptor Iblee for farther linking plays or simply get their full benefit back with
Monster Reborn and
World Legacy Inheritor.
Swap Frog to combo with
Nimble Angler and get 3 monsters on the board without normal summoning, to then send
Ronintoadin to the GY and get a free +1 after link summoning with
Swap Frog. Don't forget that you can ram
Nimble Sunfish into the ennemy monsters to send
Nimble Angler to the GY and that you can bait a destrution effect with
Nimble Mantato get a +1 out of its loss.
3 copies of
Knightmare Corruptor Iblee because she usually is the one you normal summon to then go into
Knightmare Mermaid, to then use her effect to special summon another one from the
deck, which automatically makes you go down to 1 copy of her and you don't want to draw the only two you would have. It can seem bricky but that's more optimal than it seems.
Dot Scraper,
Glow-Up Bulb,
Nimble Angler,
Treeborn Frog and
Ronintoadin as discard cost for the Knightmare crads effect (and
Foolish Burial targets) to get a free monster on the field.
Predaplant engine to get
Instant Fusion (only 2 to avoid briking or rendering the search useless by already having one in hand), then going into
Thousand-Eyes Restrict and eventualy into
Linkuriboh (only one copy because it can recycle itself with another
Thousand-Eyes Restrict).
If your opponent ever co-links and get the effect of your Knightmares, don't forget that Knightmare Unicorn can pop anything easily to break their co-linking and so can
Thousand-Eyes Restrict and Akashic Magician (with the right setup).
Side deck of Solemns cards is mainly here to ever stop monsters like
Castel, The Skyblaster Musketeer from ruining your precious co-linking, if you are aware that your opponent has that kind of removal.
Royal Decree and
Red Reboot are there to stop Altergeist from blocking your magic cards and completly shutting down your plays. Don't forget to remove
Treeborn Frog from your deck if you ever side a trap card.
Salvage and
Raigeki can be freely swapped with a 3rd
Instant Fusion (if the opponent monster are tricky to run over or get rid of) or a 2d
Predaplant Darlingtonia Cobra if you're scared of drawing it thus rendeering it useless.