Does Teemo's 'When You Play Me' effect go on the stack where there is a window to respond with cards like Gust?

Ruling: Yes, all 'When You Play Me' triggers go on the chain and can be reacted to.

Nuances:

• The game uses a 'chain' rather than a 'stack' for triggered effects
• Players have priority to respond to these triggers with fast spells or other reactions