Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever Dreadhorde Arcanist attacks, you may cast target instant or sorcery card with converted mana cost less than or equal to Dreadhorde Arcanist's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard this turn, exile it instead.
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