4 Mindslaver Lets Players Control Each Other It's fairly common for MTG cards, primarily blue ones, to allow players to take control of each other's permanents or get cards from each other's graveyards and put them onto the battlefield under their control
Drafting is a form of limited MTG where players take turns selecting cards from booster packs in order to build a deck on-the-fly
How to spot fake Alpha cards
These two bonus cards are intended to make entire sealed booster boxes more desirable for consumers to purchase, and also add extra value for retailers as they crack open product to sell loose boosters or set up drafts.
Hitting a creature with Unsummon then using a Thoughtseize or Essence Scatter is far from ideal as its card disadvantage, but you gotta do what you gotta do
A pretty dubious card to just jam randomly, I could imagine Aetherflux Reservoir as either a sideboard option against red or as a quasi-storm combo kill card