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This is because many of them such as Merlin, Goat and Merlin, Rabbit give you benefits whenever they leave play

For example, if you cast a spell that deals 4 damage divided among any number of targets and you choose to have it deal 2 damage to a creature and 2 damage to that creature's controller, that spell will deal 4 damage to each of them instead

This is another one that has an upside for opponents, but assuming youre doing a better job of being a tribal deck than they are, it shouldnt be an issue