Karai's Technique

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.

"The ninja who loses his temper, loses the battle." —Karai