Chrome-Scale Dragon

Flying
As Silver-Scale Dragon enters the battlefield, chose X, where X is a number less than the lowest life total among your opponents. This creature enters the battlefield with X +1/+1 counters on it.
Echo, Silver-Scale Dragon deals X damage to you (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)