It doesn't lose it as the turn ends or if another player gains control of it
It can be used to restock three of your best gone spells and lands back to your library which shuffles it for those with a Sensei's Divining Top or Sylvan Library
Prosper, Tome-Bound decks can play fairly or enable busted combo turns thanks to the mana production coupled with all that delightful card draw
This version of the deck is particularly interesting, as it cuts some land destruction spells to find room to play Lukka, Coppercoat Outcast with Emrakul, the Aeons Torn
Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.) Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.) Legendary Creature - Human Warrior Orthion, Hero of Lavabrink , : Create a token that's a copy of another target creature you control