Companion of the Claw (Blue)

Red Yellow Blue

When this attacks, if you've pitched a blue card this turn, create a Crouching Tiger in your hand.

Go again

Rulings

From the Part the Mistveil release notes

Companion of the Claw triggers when it resolves on the stack and becomes an attacking card. Whether you’ve pitched a blue card this turn is checked on the resolution of the trigger (during the attack step).
You will create a Crouching Tiger in your hand if you’ve pitched a blue card by the time Companion of the Claw’s trigger resolves on the stack, even if those pitched cards are no longer in the pitch zone (e.g. Potion of Deja Vu).

Keyword notes

Go again - Go again allows multiple actions to be played in a turn when usually playing an action with use up your action point, and therefore end your turn. A card with go again gives the controller of that card or activated ability 1 action point when it resolves.

When an action with go again resolves, its controller gains 1 action point.
Multiple instances of go again on the same card or activated ability do not stack. If a card or activated ability has multiple instances of go again when it resolves its controller gains 1 action point only.
If an action with go again does not resolve, its controller does not gain 1 action point.
You cannot reveal a card with no to Belittle. The card must have a value to its power that is 3 or less. (0 is a value)