Questing Beast’s abilities are as follows: “Vigilance, deathtouch, haste . . .” You know what? It has a lot of abilities, so instead of typing them all out here, I’ll remind you that you can see its official text by using the Gatherer card database at Gatherer.Wizards.com.

Roles are colorless enchantment tokens. Each one has the Aura and Role subtypes and the enchant creature ability.

If a permanent has more than one Role attached to it controlled by the same player, each of those Roles except the one with the most recent timestamp is put into its owner’s graveyard. This is a state-based action.

If two or more Roles controlled by the same player become attached to a permanent at the same time (perhaps due to an effect such as that of Doubling Season), that player chooses which one to keep and which are put into their owners’ graveyards.

A permanent can have multiple Roles attached to it if each one is controlled by a different player.

If the target of Questing Cosplayer’s ability is an illegal target as that ability tries to resolve, it won’t resolve. The Questing Role token won’t be created.

In rare cases, a spell or ability might attempt to create a Role token enchanting a permanent that it can’t legally enchant (because of an ability like protection from enchantments). In such cases, the Role token isn’t created.

Playtest cards aren’t legal for play in any tournament format other than Mystery Booster Limited formats. On the other hand, we expect they will spice up a wide variety of non-tournament games (as long as everyone’s on the same page about using them!).

Playtest cards use a modified version of game symbols, such as {T} and {W}. These modified symbols should be treated as the standard symbols during play.

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.