Choking Miasma is a uncommon Sorcery card from Dominaria United (DMU), collector number 86. Current market price: $0.16 (foil $0.18), TCGplayer market prices via Scryfall.
Kicker {G} (You may pay an additional {G} as you cast this spell.) If this spell was kicked, put a +1/+1 counter on a creature you control. All creatures get -2/-2 until end of turn.