Every Last Vestige Shall Rot is a common Scheme card from Archenemy Schemes (OARC), collector number 11★. Current market price: $2.93, TCGplayer market prices via Scryfall.
When you set this scheme in motion, you may pay {X}. If you do, put each nonland permanent target player controls with mana value X or less on the bottom of its owner's library.