Expedition Through Time

Whenever you draw a card, instead look at the
top two cards of your library. Exile one of them,
put the other in your hand. Then put a journey
counter on Expedition Through Time.
Remove X journey counters: Add X mana of any
colour. Only use this mana to cast spells exiled
by Expedition Through Time.
Blink, and you might just miss it. Hesitate, and
you'll have no shot.