Kumena, Tyrant of Orazca is a mythic Legendary Creature — Merfolk Shaman card from Rivals of Ixalan (RIX), collector number 162. Current market price: $0.55 (foil $6.08), TCGplayer market prices via Scryfall.
Tap another untapped Merfolk you control: Kumena can't be blocked this turn. Tap three untapped Merfolk you control: Draw a card. Tap five untapped Merfolk you control: Put a +1/+1 counter on each Merfolk you control.