Moltensteel Dragon 4{pr}{pr}
Artifact Creature - Dragon (R)
Flying
{pr}: Moltensteel Dragon gets +1/+0 until end of turn.
4/4
Is this playable in stacks? It can come early on turn 1, then swing for 10 on turn 2 if needed. If the deck runs red it's even easier. It also has has evasion. In prison decks, the other Dragon is probably better, but in aggro stacks, I think this might be very playable. Turn 1 Lodestone, turn 2 this guy, swing 5, turn 3 play a lock piece and swing for 15.
Edit, Phyrexian red to activate, it didn't copy well.