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Fusion Summon 1 Rock Fusion Monster from your Extra Deck, by shuffling Rock monsters from your hand, field, GY, and/or banishment into the Deck as material

The deck then adds a number of powerful demons with other strong secondary abilities including Aspiring Champion (cast off the top of your deck, direct damage), Bringer (sacrifice/reanimate), Crabomination (steal spells), Demonlord Belzenlok (draw), Doom Whisperer (surveil), Dream Devourer (foretell, buff), Harvester of Souls (draw), Kothophed (draw), Orcus (removal/reanimate), Overseer (removal/creature tokens), Rakdos, Showstopper (removal), etc

Of course, this card does even more work in any deck that cares about making tokens, sacrificing things or cares about treasures specifically (dont forget Revel in Riches exists)

Doctor Who (WHO) #562z Illustrated by Tyler Walpole Magic: The Gathering, MTG