Citanul Centaurs is a rare Creature — Centaur card from Urza's Saga (USG), collector number 243. Current market price: $0.62, TCGplayer market prices via Scryfall.
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.)