Chamber Sentry GRN/232

Set: Guilds of Ravnica
Collector Code: GRN/232
Name: Chamber Sentry
Type: Artifact Creature — Construct
Oracle text: This creature enters with a +1/+1 counter on it for each color of mana spent to cast it. {X}, {T}, Remove X +1/+1 counters from this creature: It deals X damage to any target. {W}{U}{B}{R}{G}: Return this card from your graveyard to your hand.
Rarity: Rare