Overall, Impending Doom could see play in specific aggressive decks, but may not be the optimal choice compared to other available options
False Prophet, Weathered Wayfarer, and Transcendent Master are cool
10 Planechase cards
Im already theorizing a madness deck with cards like Creeping Dread or Cunning Lethemancer
BPhillipYork: Copying weird things is fun, and there's some interesting things you can do with man lands and other things that are already 4/4 but mostly I can't think of anything all that useful to do with what is essentially a doppelganger + in the Command Zone
Phelia, Exuberant Shepherd (Foil Etched) Modern Horizons 3 Market Price: $16.22 Flicker/blink effects (flicker is often preferred for triggers that occur end of turn, while blink is usually immediate) such as the one found on Phelia are often high-dollar cards, as the synergistic play styles that these cards lend themselves to are immeasurably fun build-arounds