Jamelle realized he had stowed away inside the book 20 years ago for safekeeping
Okay, so there are a lot of Magic: The Gathering cards to explore, with the vast majority of them admittedly not good or rather unimpactful
The flashback is great to give you something to do when youre down to the last few cards in hand, too
The three main creatures youre going to be exiling now are: Eternal Scourge Misthollow Griffitn Squee, the Immortal All three of these creatures let you cast them from exile, and since youre always netting one more mana per activation, you can set yourself up with infinite mana
The same is also true of any other abilities that modify how a land enters the battlefield or apply as a land enters, such as that of Vesuva or Cavern of Souls
So, it's a slower Shock for the same price