Eren Yeager, Radical

Whenever you cast a creature spell with mana value 4 or greater, you may draw a card, gain 1 life, and put a +1/+1 counter on Eren Yeager, Radical.

{t}: Add X mana of any one color, where X is Eren Yeager, Radical's power. Spend this mana only to cast creature spells with mana value 4 or greater or creature spells with {x} in their mana costs.