You may look at and play those cards for as long as they remain exiled, and you may spend mana as though it were mana of any color to cast those spells
White Auracite Rating: 5/10 This is an interesting, fresh take on the typical Oblivion Ring design
From there, a Walking Ballista can win the game, and this combo can be set realistically on turn 3 if you have a good hand or with the help of some creature tutors
This is my favorite since you draw more in a multiplayer setting
Black has plenty of tutors, or you can use a card like Buried Alive to dump Phyrexian Dragon Engine into your graveyard, then use its unearth ability to have it attack with Mishra
That suggests computer scientists need to rethink their ideas about games, particularly if they hope to produce a unified computational theory of games