Glen Elendra's Answer is a mythic Instant card from Lorwyn Eclipsed Promos (PECL), collector number 52p. Current market price: $3.55 (foil $4.24), TCGplayer market prices via Scryfall.
This spell can't be countered. Counter all spells your opponents control and all abilities your opponents control. Create a 1/1 blue and black Faerie creature token with flying for each spell and ability countered this way.