Carth, Ignition Magus

Landfall — Whenever a land enters under your control, you may exile the top card of your library with an ignition counter on it.

{2}, {t}: Remove an ignition counter from a card
you own in exile. You may cast that card until end
of turn. When you do, it deals damage equal to it's mana value to any target.

Partner (You can have two commanders if both have partner.)