infinite combo mtg card ghost town Retreat to Coralhelm +Walking Atlas +Ghost + Magic: the Gathering Teysa, Envoy of Ghosts Commander

The abilities resolve and you end up with infinite +1/+1 counters on two creatures, plus the ETB and death triggers

That's a powerful way to ramp up your mana base with some mana-producing artifacts, or you could just have two Darksteel Colossuses bouncing around

Peregrin Took + Experimental Confectioner is a powerful combo that can be used in Ygra decks, too, and it revolves around playing Experimental Confectioner after Peregrin Took in order to create two Food Tokens

Maybe we only want/need a 5 creatures out of the 20 in all graveyards and their mana value isn't that much either

Memorial Vault (Rare) A powerful artifact that works both as a sacrifice outlet and a topdeck manipulator , letting you play cards before theyre exiled