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Palkia VSTAR, for instance, seems like a good candidate to be paired up with Blastoise

RD/KP15-JP026 Wyvern no Kurokishi (Black Knight of Wyvern/Alligators Black Knight) Level 4 DARK Beast Effect Monster ATK 1200 DEF 1200 [REQUIREMENT] Can be used if Alligators Sword or a DARK monster with 1200 DEF is in your GY

He is defeated by Yusei, but before he dies, he triggers an explosion that sends Yusei down into the pool of Ener-D

I think it will be good for the format due to fast mana such as Simian Spirit Guide, Tron Lands and Bouncelands being viable in the format

Deck Archetypes You could always choose a deck archetype to base your deck around