Taeko, the Patient Avalanche is a mythic Legendary Creature — Turtle Ninja card from Foundations Jumpstart (J25), collector number 39. Current market price: $2.58, TCGplayer market prices via Scryfall.
Taeko enters tapped. Whenever another creature you control leaves the battlefield, if it didn't die, scry 1 and put a +1/+1 counter on Taeko. Whenever Taeko attacks, you may pay {U/B}. When you do, target attacking creature can't be blocked this turn.