The Last Ronin's Technique is a uncommon Instant card from Teenage Mutant Ninja Turtles (TMT), collector number 223. Current market price: $0.28 (foil $0.36), TCGplayer market prices via Scryfall.
Sneak {1}{W} (You may cast this spell for {1}{W} if you also return an unblocked attacker you control to hand during the declare blockers step.) Create three 1/1 white Ninja Turtle Spirit creature tokens. If this spell's sneak cost was paid, they enter tapped and attacking.