I dont think the warp cost matters all that much, but its cheap enough that if you know youre going to sacrifice something, you can cheat Susurian Voidborn in and get some free value for your trouble
But for a real TCG experience, you need variable scarcity
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(You descended if a permanent card was put into your graveyard from anywhere.) Legendary Artifact Cavalier of Flame : Creatures you control get +1/+0 and gain haste until end of turn
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This is right at home in life gain decks, where any amount of life you gain will be doubled