Grit’Claw from Below

Flying, Ward — Grit’Claw deals 4 damage to target opponent. Grit’Claw costs {1} less for each damage you dealt to an opponent this turn.

Whenever Grit’Claw deals damage to an opponent, exile cards from the top of your library equal to the damage dealt. Then you may cast creature cards exiled this way with total converted mana cost less than or equal to Grit’Claw’s power without paying their mana costs until end of turn.