Guzy, Wagerer of Fates

Haste

Whenever Guzy, Wagerer of Fates attacks, exile the top three cards of your library. Choose one of them at random. You may play that card this turn, and it gains "If this spell would deal damage, it deals double that damage instead."
Whenever you cast a spell this way, flip a coin. If it is heads, create two treasure tokens. If it is tails, you lose 2 life.
"Every risk has its reward, even if it’s just the thrill of the gamble."