Most of the strongest Voltron cards are colorless Equipment, giving you free rein on the colors you can play
The payoff of becoming a creature that gives all your stuff flying is pretty great too, even if its susceptible to removal

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If you keep squeezing the top loader open as you pull the card out, you could pop the top loader to a U shape and permanently crease your card before its all the way out
Plus, Ive already seen a version of Red Deck Wins in Modern that looks promising, and it probably wont cost much to build, either
Legendary Creature - Wizard Merfolk Phyrexian Draw (CTRL to add secondary) Finisher Finisher (CTRL to add secondary) Land Demolition Field : Add