Mine Collapse

If it's your turn, you may sacrifice a Mountain
rather than pay this spell's mana cost.
Mine Collapse deals 5 damage to target
creature or planeswalker.
A network of twisting tunnels within the volcano
where Rionya's attempts to recreate her past have
manifested in ethereal illusions. Travelers risk losing themselves in these illusions, reliving the tragic events
of the past.