Combined Firepower (UR-ALT CHA03-KRM 4/22)

This card does not count toward progressive difficulty.Response [Discard Pile]: After you remove a card to pay a cost, you may try to play this card during this attack.Enhance: Mill 4. This attack gets +1 damage for each non-foundation milled this way.

Combined Firepower from Challengers Godzilla & Mothra, King Ghidorah & Rodan sets.
Univerus card game.