Description

This article is from the Magic: The Gathering Rules FAQ, by Patrik Linell (pls@claymore.nu) with numerous contributions by others.

41 What's the difference between a cost and an effect? (Magic: The Gathering Rules)

Costs happen immediately, effects go on the stack. If you
sacrifice a creature to pay for Fallen Angel's ability, your opponent
cannot destroy that creature in response, since costs don't use the stack.

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