Kumena, Tyrant of Orazca is a mythic Legendary Creature — Merfolk Shaman card from Secret Lair Drop (SLD), collector number 1412. Current market price: $17.95, 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.