Like most Magic: The Gathering cards, the value of Imperious Perfect depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Duel Decks Anthology: Elves vs
Borderless cards are #292-376 ("revved up" is #292-332) and extended art cards are #377-396
This is an exceptional discount compared to the market price, but it is still a fairly substantial price for a common card
The scariest of these combos is a two-card instant kill using Sydri and Aetherflux Reservoir, which also requires you to have over 50 life
Theres also Brotherhood Regalia and Coerced to Kill and other effects that add assassin to their equipped/enchanted creatures types
Audacious SwapAudacious Swap is a more expensive, worse Chaos WarpChaos Warp that you can do twice if you sacrifice a creature, but does say "cast" instead of "put onto the battlefield", and therefore allows you to try and get a couple bites at the apple