If you would guess a card, instead just choose the outcome you want. At the beginning of each opponent's upkeep, look at the top card of their library. Tell them the name of that card. They tell you its mana cost, type line, power, and toughness. Then reveal that card. If they got anything wrong, draw a card.
Near Mint - $14,300
Lightly Played - $11,400
Moderately Played - $10,000
Heavily Played - $8,600
Damaged - $7,200
Near Mint Spanish - $14,300
Lightly Played Spanish - $11,400
Moderately Played Spanish - $10,000
Heavily Played Spanish - $8,600
Damaged Spanish - $7,200