Mind Carver is a uncommon Artifact — Equipment card from Zendikar Rising (ZNR), collector number 113. Current market price: $0.20 (foil $0.22), TCGplayer market prices via Scryfall.
When this Equipment enters, attach it to target creature you control. Equipped creature gets +1/+0. It gets +3/+1 instead as long as an opponent has eight or more cards in their graveyard. Equip {2}{B}