The only means of getting rid of it is playing a card that'll wipe the board or prevent it from being summoned in the first place.
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Whenever it deals combat damage to a player it gives you an extra combat phase
Sideboard Example: Burn Heres my burn deck
This card could easily fit into black midrange strategies, but all of those decks have restructured around Unholy Annex since it was released in Duskmourn, House of Horrors
The drawback of also providing an opponent with three cards will feel pretty terrible if your game is down to two players, but the rest of the time, youll often be in a position where those cards could be granted for favors (Dont attack me for the next two turns!) or in order to help another weaker player take down the table threat