Shard of Rydik

If Shard of Rydik enters the battlfied, if it wasn't
cast, exile it.
When Shard of Rydik is put into a graveyard,
each opponent exiles the top fifty cards of their
library for each card named Shard of Rydik
sent to the graveyard from the battlefield
this game.
You may cast Shard of Rydik from your graveyard
or exile by paying {1}{w}{g}{r}{r}{u}{u}.