Soulshriek

Instant, B (1)
Target creature you control gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard. Sacrifice that creature at end of turn.¹
"The flesh is a casket for the soul." -Shauku, Endbringer
Illus. John Bolton

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/6)	Mirage (Common)