Coralhelm Commander is a rare Creature — Merfolk Soldier card from Rise of the Eldrazi (ROE), collector number 57. Current market price: $0.45 (foil $7.50), TCGplayer market prices via Scryfall.
Level up {1} ({1}: Put a level counter on this. Level up only as a sorcery.) LEVEL 2-3 3/3 Flying LEVEL 4+ 4/4 Flying Other Merfolk creatures you control get +1/+1.