Mine Layer is a rare Creature — Dwarf card from Odyssey (ODY), collector number 205. Current market price: $3.23 (foil $8.19), TCGplayer market prices via Scryfall.
{1}{R}, {T}: Put a mine counter on target land. Whenever a land with a mine counter on it becomes tapped, destroy it. When this creature leaves the battlefield, remove all mine counters from all lands.