Manaplasm: interesting and can get really big in Green
At the end of your turn, if youve got seven or more DON
Now I want to build blue-X decks and blue-X-Y decks (X, Y, being some other color)
Necrotic Sliver Necrotic Sliver turns your slivers into colorless Vindicate effects
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Our commander can obviously fulfill the requirement, but in any deck with enough legends, this card can have a huge swing in games and is relatively cheap in both mana and dollars