Marcy: Looting in UW colors is really interesting, especially because Arcade has the potential to allow you to cycle things in and out of your graveyard easily if he isn't removed
The commander doesn't bring enough to the game, and this list is pulling a few punches
(It's an artifact with ", Sacrifice this token: Add one mana of any color.") Partner (You can have two commanders if both have partner.) Legendary Creature - Pirate Siren Commander (CTRL to add secondary) Cantrip Cantrip (CTRL to add secondary) Cards Rowan's Grim Search Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) If this spell was bargained, look at the top four cards of your library, then put up to two of them back on top of your library in any order and the rest into your graveyard
You'll often see these in use at MagicCons in the Command Zone, and for good reason, they're much smaller and easier to organize than a full backpack
As far as the Mirage block is concerned, he exists purely in card names and in flavor text