Mine Collapse 
Instant
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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL