Aatchik, Emerald Radian is a rare Legendary Creature — Insect Druid card from Aetherdrift Promos (PDFT), collector number 187p. Current market price: $0.62 (foil $1.35), TCGplayer market prices via Scryfall.
When Aatchik enters, create a 1/1 green Insect creature token for each artifact and/or creature card in your graveyard. Whenever another Insect you control dies, put a +1/+1 counter on Aatchik. Each opponent loses 1 life.