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Then, At the beginning of your end step, choose target creature card in your graveyard

Karl : That's a toughie

For example, if an effect has given Bear Cub, a 2/2 creature, -4/-0 so that it's a -2/2 creature, doubling its power and toughness gives it -2/+2, and it becomes a -4/4 creature

The downside is that this ability affects you too so you will want to pack your deck to the brim with all sorts of ways to gain life in the meantime

Including map-users like Quirion Ranger, Hanna, Ships Navigator, and Time-Stream Navigator offers us a variety of effects to consider amplifying when we start making cuts and building out how we want this deck to function and maybe even win, if were lucky