Whats your stance on proxies

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In case youre not familiar with this hole card, heres how it works: Whenever your opponent summons a monster with 1500 attack or more, you can flip this card face-up to destroy and banish that monster
Since your graveyard now contains a creature, artifact, instant, and sorcery, you have delirium, allowing you to attack for four damage on turn two
Due to the way this ability is worded, milling several creatures at once only generates one zombie, so Sidisi decks often want to be filled with creatures and means of repeatedly milling small numbers of cards to make an enormous zombie horde