Players are only allowed to have one copy of any card in vintage
The big picture Surveil provides an excellent example of conservation of design space
Related While the box includes a bunch of goodies to expand your Magic: The Gathering | Avatar: The Last Airbender collection, the standouts are six foil scene cards that can be placed in order to depict artist Fahmi Fauzis take on the Black Sun Invasion
These spells and abilities allow you to deal with your opponents' early game threats while you build your shrine army, accelerate to more quickly play your shrine army, and card draw allows you to keep pressure on your opponent as you get to the mid to late game
In the later stages of the game, your opponents won't have mana to re-cast anything most of the time, forcing them to discard much of their newly bounced cards to the graveyard and lose access to them
If you choose not to cast a spell this way, it goes to the bottom of the library with the other exiled cards