[Foil] Karai's Technique - Teenage Mutant Ninja Turtles

Sneak {W}{B} (You may cast this spell for {W}{B} if you also return an unblocked attacker you control to hand during the declare blockers step.) Choose one or both — • Target creature gets +3/+3 until end of turn. • Target creature gets -3/-3 until end of turn.