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 - $0.95
Lightly Played - $0.90
Moderately Played - $0.71
Heavily Played - $0.57
Damaged - $0.38
Near Mint Non-English - $0.95
Lightly Played Non-English - $0.90
Moderately Played Non-English - $0.71
Heavily Played Non-English - $0.57
Damaged Non-English - $0.38