Lavabirth Geist

You can't cast Lavabirth Geist unless there is a Mountain card in your graveyard.
Whenever a Mountain card is put into your
graveyard from anywhere, you may pay {p/r}.
If you do, return Lavabirth Geist from your graveyard to your hand.
{p/r}: Lavabirth Geist gets +1/+0 until end of
turn. Activate only once each turn.