Nerrom The World Swallower

Flying,Lifelink,Trample
When you cast Nerrom The World Sallower choose Khans or Dragons.
•Khans-Whenever a dragon enters the battlefield under your control you may gain life equal to its power.
•Dargons-Whenever a dragon enters the battlefield under your control you may have it gain +5/+5 lifelink and trample.