Does Wildclaw Shaman's effect of removing a buff to buff and ready itself go on the chain, allowing the opponent to cast Gust in response?

Ruling: Yes, Wildclaw Shaman's effect is a triggered ability that creates a chain. The opponent can respond with Gust while the trigger is on the chain.

Sequence:

• Wildclaw Shaman is played to the battlefield
• Its triggered ability goes on the chain
• Opponent can respond with Gust (targeting either the Poro or the Shaman if it's on a battlefield)
• When the Shaman's trigger resolves, the buff is removed from the other unit, then the Shaman is buffed and readied

Nuances:

• Gust can only target units at a battlefield
• While the Shaman's trigger is on the chain, the Shaman is still 3 Might and targetable by Gust (if at a battlefield)
• The buff removal happens on resolution of the trigger, not as a cost
• No targeting is required for Wildclaw Shaman's effect