Inflict 1000 damage to your opponent for each face-up "Mine Golem" on your side of the field. After that, destroy all face-up "Mine Golem"(s) on your side of the field.
Rulings
Individual Card FAQs
If you activate “Minefield Eruption”, you inflict damage, then send your “Mine Golem”(s) to the Graveyard. So your opponent has missed the timing and cannot activate “Numinous Healer”, etc.
The number of “Mine Golem” cards is considered when “Minefield Eruption” resolves, not when it is activated.
Trap|
Normal