When Duelists' Convocation International enters the battlefield, choose a 10-digit number at random and write it down. Whenever you play a land or cast a spell, if it shares a mana value with one or more uncrossed digits in the chosen number, cross out one of those digits and draw a card. Then if all ten digits are crossed out, you win the game.
NM-Mint - $3.10
Lightly Played - $2.80
Moderately Played - $2.50
Heavily Played - $2.20
Damaged - $1.50
NM-Mint Non English - $3.10
Lightly Played Non English - $2.80
Moderately Played Non English - $2.50
Heavily Played Non English - $2.20
Damaged Non English - $1.50