At the beginning of each player's upkeep, Power Surge deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn.
Near Mint - $600
Lightly Played - $500
Moderately Played - $500
Heavily Played - $400
Damaged - $300
Near Mint Spanish - $600
Lightly Played Spanish - $500
Moderately Played Spanish - $500
Heavily Played Spanish - $400
Damaged Spanish - $300