生物~流浆
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在你的维持开始时,若你操控黑色永久物,则你可以在血廊流浆上放置一个+1/+1指示物。
在你的维持开始时,若你操控绿色永久物,则你可以在血廊流浆上放置一个+1/+1指示物。
A permanent that’s both black and green will allow both abilities to trigger (as will separate black permanents and green permanents, of course).
The “intervening ‘if’ clause” means that (1) the ability won’t trigger at all unless you control a permanent of the specified color, and (2) the ability will do nothing unless you control a permanent of the specified color at the time it resolves.