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Interaction needs to be leaner, or at least do more at that cost

Assault Synchron X DARK Level 2 [ MachineTunerEffect ] ATK 700 DEF 0 During your Main Phase: You can Special Summon this card from your hand, then take 700 damage, also while it is face-up in the Monster Zone, you cannot Special Summon from the Extra Deck, except Synchro Monsters

These cards all interact, to additionally multiply token production from 2x to 4x and beyond, so critical mass is a good way to end the game in combination with your drain effects

Which cards belong in our top 5

Smash Like if you're an Elves player

Third heart: The Player and Zuzu Boyle Tag Duel against Sora Perse and Shay