Ice Troll Of 'Nia

: Whenever your creatures attack target player puts that many cards from their Library into the graveyard.
+5: Create a 5/5 ice wall creature token that has Defender when it dies it does 5 damage to you.
-20: Ice Troll Of 'Nia "Tui becomes a 20/1 multicolor creature until end of turn and when he dies you win the game automatically