Cheapest priced copy (Innistrad: Double Feature): $0.35 at Card Kingdom, near mint, their price list as of .
Screaming Swarm 
Creature — Bird Horror · 4/4 · Uncommon · Innistrad: Crimson Vow · #75
Flying
Whenever you attack with one or more creatures, target player mills that many cards. (To mill a card, a player puts the top card of their library into their graveyard.)
{2}{U}: Put this card from your graveyard into your library second from the top.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 342 | Uncommon | $0.35 | $0.49 |
| Foundations Jumpstart | 351 | Uncommon | $0.35 | — |
| Innistrad: Crimson Vow | 75 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 November 2021You may target yourself with Screaming Swarm's triggered ability.