Mindstab is a common Sorcery card from The List (PLST), collector number TSP-119. Current market price: $0.03, TCGplayer market prices via Scryfall.
Target player discards three cards. Suspend 4—{B} (Rather than cast this card from your hand, you may pay {B} and exile it with four time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)