Chamber Sentry [Guilds of Ravnica]

Set: Guilds of Ravnica Type: Artifact Creature — Construct Rarity: Rare Cost: {X} Chamber Sentry enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.{X}, {T}, Remove X +1/+1 counters from Chamber Sentry: It deals X damage to any target.{W}{U}{B}{R}{G}: Return Chamber Sentry from your graveyard to your hand.