クリーチャー — ファンガス・蛇
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いずれかの対戦相手が青か黒の呪文を1つプレイするたび、あなたはカビのマムシの上に+1/+1カウンターを1個置いてもよい。
If an opponent casts a spell that's both blue and black, Mold Adder's ability triggers only once.
Mold Adder's ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack without resolving.