Yin and Yang

: This creature has 10/10 as long as it has loyalty points and when it dies sacrifice both Zihn Yin and Xavian Yang
+2: Deal 6 damage to target creature and take 2 damage or gain only 1 loyalty counter, draw a card
-15: YIN AND YANG, Destroy all creatures and Planeswalkers except ninjas, you may draw a card for every creature discarded this way