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 - £0.40
Lightly Played - £0.40
Moderately Played - £0.30
Heavily Played - £0.20
Damaged - £0.20
Near Mint Non English - £0.40
Lightly Played Non English - £0.40
Moderately Played Non English - £0.30
Heavily Played Non English - £0.20
Damaged Non English - £0.20
Foil Prices
Near Mint Foil - £0.80
Lightly Played Foil - £0.70
Moderately Played Foil - £0.60
Heavily Played Foil - £0.40
Damaged Foil - £0.30
Near Mint Foil Non English - £0.80
Lightly Played Foil Non English - £0.70
Moderately Played Foil Non English - £0.60
Heavily Played Foil Non English - £0.40
Damaged Foil Non English - £0.30