The Swarmweaver is a rare Legendary Artifact Creature — Scarecrow card from Duskmourn: House of Horror (DSK), collector number 363. Current market price: $0.40 (foil $1.25), TCGplayer market prices via Scryfall.
When The Swarmweaver enters, create two 1/1 black and green Insect creature tokens with flying. Delirium — As long as there are four or more card types among cards in your graveyard, Insects and Spiders you control get +1/+1 and have deathtouch.