Svyelun of Sea and Sky is a mythic Legendary Creature — Merfolk God card from Modern Horizons 2 (MH2), collector number 310. Current market price: $5.57 (foil $8.83), TCGplayer market prices via Scryfall.
Svyelun has indestructible as long as you control at least two other Merfolk. Whenever Svyelun attacks, draw a card. Other Merfolk you control have ward {1}. (Whenever another Merfolk you control becomes the target of a spell or ability an opponent controls, counter it unless that player pays {1}.)