Katrahaska, Fallen War Machine

Superconductor (All Powered creatures you control
get 0/+1.)
When Katrahaska, War Machine enters the battlefield under your control, you get X {e} (X
energy counters) where X is equal to the number
of Powered creatures in your graveyard.
{t}, Pay (9){e}{e}{e}{e}{e}{e}{e}{e}{e}: Add 4 mana
of one color to your mana pool.