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.
Near Mint - $0.40
Lightly Played - $0.40
Played - $0.30
Heavily Played - $0.30
Damaged - $0.20
Near Mint Non-English - $0.40
Lightly Played Non-English - $0.40
Played Non-English - $0.30
Heavily Played Non-English - $0.30
Damaged Non-English - $0.20