Whenever Tyrannosaurus Rex attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs.
NM-Mint - $17.20
Lightly Played - $16.30
Moderately Played - $15.50
Heavily Played - $13.70
Damaged - $11.20
NM-Mint Non English - $17.20
Lightly Played Non English - $16.30
Moderately Played Non English - $15.50
Heavily Played Non English - $13.70
Damaged Non English - $11.20