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It changes the entire meta into something completely new that you cant go back from without banning every card in the set

And then when it, or another Nightmare or Horror arrives to the party, a target exiles cards from their library until they exile a land, which suggests exiling milling

Similarly, you can respond to activations of Planeswalkers like Karn, the Great Creator, rendering them useless

In the case of copying a permanent with gift that already exists on the battlefield, no gift can be promised whether or not the gift was given when it was first played

Double-Sleeving If you want extra protection Golgari sleeves are designed to be double-sleeved

Cutting it from a competitive deck and trying to swap in something else would almost never be recommended because the card is too important to the deck's overall strategy