Rampaging Heldrake

If you have 5 or more Maintenance counters, you
may pay {2}{r} instead of its normal mana cost.
Infernal, flying
Whenever an artifact you control is destroyed,
you may discard a card. If you do so, draw a card.
During your endstep, if you discarded 7 or more cards, you may put an artifact from your
graveyard onto the battlefield tapped.