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This is partly because there are a critical mass of creatures with those types in Black/Green and partly because there are some other payoffs out there that overlap into both of those creature types

(4/14/2023) If a token or a card that isn't represented by a double-faced card becomes a copy of a Siege, it can't be cast as its triggered ability resolves

while greens will replace creatures you lose with sapporlings, which will only be used in limited BG sacrifice decks, and reds will only be used in limited goblin decks because they have to dial it back during testing because its concepts are way too effective otherwise

The Dawn of Destiny video game included Ra, the Yu-Gi-Oh

and she defends herself while assembling her strategy, like Karametra