The Swarmweaver 
Legendary Artifact Creature — Scarecrow
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.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL