Uras, the Beneficiary

Lifelink
When Uras enters the battlefield, create a 6/6
black Demon token with flying and "Whenever
this creature attacks or blocks, sacrifice a
permanent or mill a card."
Whenever a demon leaves the the battlefield, put
a charge counter on Uras.
{t},Remove 3 charge counters from Uras: You
gain 10 life.