Teferi, Timemage Unbound

+1: Until your next turn, you may cast instant spells as though they had flash.
-2: You get an emblem with, "Whenever a creature you control dies, sacrifice 2 lands, discard 2 cards, or sacrifice Teferi, Timemage Unbound."
-10: Flip a coin until you lose. Whenever you win a coin flip this way untap target land you control.