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Many such cards have a triggered ability that transforms the card (when it's on the battlefield.) One of the most typical such ability is " at the beginning of each upkeep, if no spells were cast last turn, transform (this card) ." Many players actually don't realize that this is a normal triggered ability that uses the stack, and therefore can be responded to

Any ability that says a player wins or loses the game still works

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Chasm Guide

Having very little control over how much life you are paying and how many cards you are getting is not a great advertisement for a cards