Baal, Electro Archon

Commander ninjutsu {2}{u/b} ({2}{u/b}, Return an
unblocked attacker you control to hand: Put this
card onto the battlefield from your hand or the
command zone tapped and attacking.)
Whenever a Ninja deals combat damage to a
player, you get {e}{e} ( Two energy counters).
You may spend {e} as though it were mana of
any color as long as Baal, Electro Archon is
on the battlefield.