Splinter, Radical Rat (#251)

Type: Legendary Creature — Mutant Ninja Rat

Text: If a triggered ability of a Ninja creature you control triggers, that ability triggers an additional time.
{1}{U}: Target Ninja can't be blocked this turn.

"You have corrupted my teachings. Now you will pay for your crimes."

Set: Teenage Mutant Ninja Turtles (#251)