Soul Echo enters the battlefield with X echo counters on it. You don't lose the game for having 0 or less life. At the beginning of your upkeep, sacrifice Soul Echo if there are no echo counters on it. Otherwise, target opponent may choose that for each 1 damage that would be dealt to you until your next upkeep, you remove an echo counter from Soul Echo instead.
Near Mint - $1.40
Lightly Played - $1.10
Moderately Played - $1.00
Heavily Played - $0.80
Damaged - $0.70
Near Mint Spanish - $1.40
Lightly Played Spanish - $1.10
Moderately Played Spanish - $1.00
Heavily Played Spanish - $0.80
Damaged Spanish - $0.70