Magus of the Mind
Creature — Human Wizard
, 
, Sacrifice Magus of the Mind: Shuffle your library, then exile the top X cards, where X is one plus the number of spells cast this turn. Until end of turn, you may play cards exiled this way without paying their mana costs.
"I'll show you what you truly desire."
Illustrated by
Commander 2017#12RareEnglishLegality
Rulings
If no spells have been cast in the turn you activate Magus of the Mind’s ability, X is one.
You may play a land exiled this way only if you have an available land play this turn.
You must follow the normal timing permissions and restrictions for cards you cast this way.
If you cast a card “without paying its mana cost,” you can’t pay any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Tormenting Voice, those must be paid to cast the card.
If the card has 
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
Any of the cards you don’t play will remain in exile.