Goatbane Dragon

Flying
When you cast Goatbane Dragon roll a 20 sided die, then sacrifice a number of Goat tokens equal to the number on the die. If you can't, Goatbane Dragon deals X damage to you equal to the difference. If you can, you gain 1 life for each Goat token remaining on the battlefield under your control. If the number of tokens you control was equal to the number on the die, Goatbane Dragon gains haste and gets +X/+X until end of turn.