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 - $33.00
Lightly Played - $31.40
Moderately Played - $29.70
Heavily Played - $26.40
Damaged - $21.50
NM-Mint Non English - $33.00
Lightly Played Non English - $31.40
Moderately Played Non English - $29.70
Heavily Played Non English - $26.40
Damaged Non English - $21.50