Magmatic Sinkhole is a common Instant card from Modern Horizons (MH1), collector number 135. Current market price: $0.15 (foil $0.32), TCGplayer market prices via Scryfall.
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Magmatic Sinkhole deals 5 damage to target creature or planeswalker.