Magmasoul Erupter

Mountainwalk, Haste
When Magmasoul Erupter deals combat damage
to a player, add that much {r} to your mana pool.
This mana doesn't empty as steps and phases end
until the end of turn.
As long as Magmasoul Erupter is in your
graveyard and you control a mountain, creatures
you control have, "When this creature deals
combat damage to a player, add {r} to your mana
pool. This mana doesn't empty as steps and
phases end until the end of turn."