Omnivorous Flytrap is a rare Creature — Plant card from Duskmourn: House of Horror Promos (PDSK), collector number 192p. Current market price: $0.29 (foil $0.38), TCGplayer market prices via Scryfall.
Delirium — Whenever this creature enters or attacks, if there are four or more card types among cards in your graveyard, distribute two +1/+1 counters among one or two target creatures. Then if there are six or more card types among cards in your graveyard, double the number of +1/+1 counters on those creatures.