Time Borrow

Target opponent takes an extra turn after their
next one. At the beginning of that turns end step,
the player whose turn it is loses the game.
Ego {r}{r} (You may cast this spell for its ego cost. If
you do, change its text by replacing all instances of
"target opponent" with "you.")
"Whenever people ask me what I do with all the time
I take I tell them I save it for a rainy day."
-Jack, Burning Luminary