Cheapest priced copy (Forgotten Realms Commander): $1.49 at Card Kingdom, near mint, their price list as of .
Piper of the Swarm 
Creature — Human Warlock · 1/3 · Rare · Forgotten Realms Commander · #106
Rats you control have menace.
{1}{B}, {T}: Create a 1/1 black Rat creature token.
{2}{B}{B}, {T}, Sacrifice three Rats: Gain control of target creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $1.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 106 | Rare | $1.49 | — |
| Throne of Eldraine | 100 | Rare | $1.49 | $1.49 |
| Throne of Eldraine | 355 | Rare | $3.99 | $4.99 |
| Throne of Eldraine | 392 | Rare | — | $1.49Out of stock |
| Throne of Eldraine Promos | 100p | Rare | $2.29 | $2.49 |
| Throne of Eldraine Promos | 100s | Rare | — | $1.79 |
| Secret Lair Drop | 7074 | Rare | — | $2.79 |
One ruling from Wizards of the Coast
- 4 October 2019The control-change effect of Piper of the Swarm's last ability lasts indefinitely. It doesn't wear off during the cleanup step, and it doesn't expire if Piper of the Swarm leaves the battlefield. In a multiplayer game, it does expire if you leave the game.