You may exert Champion of Rhonas as it attacks. When you do, you may put a creature card from your hand onto the battlefield. (An exerted creature won't untap during your next untap step.)
The only way to finish the Trial of Strength is with a basilisk scale in hand.
Near Mint - $400
Lightly Played - $300
Moderately Played - $300
Heavily Played - $300
Damaged - $200
Near Mint Spanish - $400
Lightly Played Spanish - $300
Moderately Played Spanish - $300
Heavily Played Spanish - $300
Damaged Spanish - $200
Foil Prices
Near Mint Foil - $1.200
Lightly Played Foil - $1.000
Moderately Played Foil - $900
Heavily Played Foil - $800
Damaged Foil - $600
Near Mint Foil Spanish - $1.200
Lightly Played Foil Spanish - $1.000
Moderately Played Foil Spanish - $900
Heavily Played Foil Spanish - $800
Damaged Foil Spanish - $600