Elspeth, Knight Vengeant

+2: Exile target nonland permanent. Elspeth, Knight Vengeant deals damage to target creature or player equal to the permanent's converted mana cost.
-2: Put three 1/1 red soldier creature tokens with haste onto the battlefield.
-X: Until end of turn, Elspeth, Knight Vengent becomes a legendary X+1/X+1 knight creature with indestructible, double strike, and vigilance.