Evolving Door

{1}, {T}, Sacrifice a creature: Count the colors of the sacrificed creature, then search your library for a creature card that's exactly that many colors plus one. Exile that card, then shuffle. You may cast the exiled card. Activate only as a sorcery.

{1}，{T}，牺牲一个生物：计算所牺牲生物的颜色种数，然后从你牌库中搜寻一张颜色种数正好为该数量加一的生物牌。放逐该牌，然后洗牌。你可以施放所放逐的牌。只能于法术时机起动。