Taeko, the Patient Avalanche (J25-039) - Foundations Jumpstart
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.
Pickup available at Mana Market Online
Usually ready in 24 hours