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Effects like this usually require you to exile the creature you bring back, but Feldon allows you to target the same creature in your graveyard over and over

You can also do some weird stuff with this, like name Illusion and play Lord of the Unreal in a blue deck, or have Spirit tokens be your main crew creatures, name Spirit with the Engine, and play Drogskol Captain

With additional ways to stack poison counters, the deck pushes toward a fast, inevitable victory

I mean, before the Pro Tour I dont know many people who even had Pack Rat on their radar let alone would have bet on it sneaking into the maindeck of a Top 8 deck