A 2-mana 2/3 that rummaged would be a fine creature in its own right, but the delirium ability enables massive swings, quite literally
He does something very different, being a commander focused on guessing and grouping cards, such as with Fact or Fiction, Boneyard Parley, Brilliant Ultimatum, or Hostile Negotiations
The climax hinges on Glens attempt to stop a massive serpentine demon with a toy rocket launcher (more like a model rocket than a bazooka, but definitely a projectile that no 12-year-old should be playing with)
If everyone is stuck only drawing one card per turn, only playing one spell per turn, only attacking or blocking with one creature per turn, and so on, we should theoretically have a chance to be able to keep up with better decks