Energy is Power

Energize (You may cast this spell by paying {e}
equal to its mana value; Instead of paying its mana
cost. If that spell has an X in its cost than you
may pay any amount of {e} for X.)
As an additional cost to cast this spell, pay any
amount of {e}.
Creatures you control gain +X/+X until end of
turn. Where X is the amount of energy spent to
cast this spell.