Magic The Gathering Cards of types 'Crab' and 'Artifact'

This creature can't be blocked. When this creature enters, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.) Channel - {2}{U}, Discard this card: Counter target spell or ability unless its controller pays {3}.