The “discovered” card from Nightmare lord Xavius when used with a Clumsy Steward on the board makes the ‘discovered’ card, temporary.
Discovering a card does not = drawing a card.
NLX card text:
Battlecry: Discover a minion from your deck. Give it a dark gift.
(card discovered, a minion with reborn)
Clumsy Steward text
After ANY card is drawn, make it temporary.