Citanul Centaurs [Urza's Saga]

Set: Urza's Saga Type: Creature — Centaur Rare Cost: {3}{G} Shroud (This creature can't be the target of spells or abilities.) Echo {3}{G} (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.)