Any abilities that trigger during the resolution of Mass Polymorph (such as a creature's "enters" ability) will wait to be put onto the stack until Mass Polymorph finishes resolving. The player whose turn it is will put all of their triggered abilities on the stack in any order, then each other player in turn order will do the same. (The last ability put on the stack will be the first one that resolves.)
All creatures you put onto the battlefield with Mass Polymorph enter at the same time.
If the number of creatures you exile is greater than the number of creature cards remaining in your library, you'll wind up revealing your entire library, putting all creature cards revealed that way onto the battlefield, then shuffling your library.
Last observed on Scryfall 2 months ago at $0.32. Over the trailing 90 days the price moved between $0.02 and $0.32 across 57 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from M11 — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #64 of *Magic 2011*, the set that shipped alongside the July 2010 Magic 2011 release.
Card type: Sorcery, color identity blue, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {5}{U} (6 converted).
Legal in Modern, Legacy, Vintage, and Commander.
EDHrec ranks this card #14,312 in Commander, putting it in the fringe-play tier of the format's playable pool.
Illustrated by Christopher Moeller. Rarix catalogs 1,011 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Christopher Moeller
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
The creatures you exile with Mass Polymorph remain exiled for the rest of the game.
