Prison Reef

Whenever Prison Reef or another Elemental enter the battlefield under your control, put a permantent of your choice in the prison.
The prison is the exile.
The controller of the prisoner can roll two six sided dices. If both numbers are the same the prioner (the exiled card) go out of the prison.
{g/w}{g/w}{10} Exile all permanents your opponents controlls
A funny card that puts stuff in prisons LOL