Sovereign Okinec Ahau is a mythic Legendary Creature — Cat Noble card from The Lost Caverns of Ixalan (LCI), collector number 309. Current market price: $4.12 (foil $5.48), TCGplayer market prices via Scryfall.
Ward {2} Whenever Sovereign Okinec Ahau attacks, for each creature you control with power greater than that creature's base power, put a number of +1/+1 counters on that creature equal to the difference.