Often it's just fine to be doing this once per turn, but this is really where the extra-lands effects shine
We have found that when they cantrip, like Suit Up, they become very strong, but having the Ring tempt you is nowhere near a whole cards worth of value, so I doubt its enough to make this stand out
You can use a card with devoid on it if the mana cost matches the Commanders color identity
The pockets themselves can accommodate sleeved, Magic: The Gathering or Pokmon -sized cards too
She plunders tombs obtaining information for her trading partner, but while obtaining the whole MacGuffin for herself
Since then, so many decks have moved to use combat as their axis of interaction that Mindslaver plays like Master Warcraft slightly more often than it should