Garvi, Energy Broker

Whenever a player casts a spell, you get {e}.
Pay {e}{e}: Target player gains one mana
of any color.
Pay {e}{e}{e}: Target player draws a card.
Pay {e}{e}{e}{e}{e}: Target creature gets +X/+X,
where X is the number of {e} spent this turn.

"Now I've got the power!"