You get two options and both of them are great: either an enormous army of vampires, or a 10,000 power/ 10,000 toughness dinosaur, with trample, that spawns in already attacking one of your opponents
Common 216 Tinker Bell, Giant Fairy Enchanted The Princess and the Frog 37 Dr
Genie, On the Job is an Emerald card notable for its ability to Disappear in-game, returning a character of your choice to its players hand when played
If that werent enough, Night of Sweets Revenge can also be a win condition
Omega, Heartless Evolution [Borderless Foil] #347 (Magic Final Fantasy | Magic Cards) prices are based on the historic sales
Myr Retreivers + Krark-Clan Ironworks + Arcbound Ravager kind of stuff, but perhaps a more elegant solution that requires fewer puzzle pieces will reveal itself