When Teemo Scout is played from hidden (gaining +3 might) and then Convergent Mutation is played targeting Ravenbloom Student, what is the correct order of resolution? Specifically, does Mutation resolve before Teemo Scout's ability, and when does Ravenbloom Student gain +1 might from its spell trigger?

Ruling: The timing depends on when Mutation is played. If Mutation is played immediately after Teemo Scout is added to the chain (before Teemo's ability resolves), Mutation resolves first when Teemo is still at 1 might. If players allow Teemo's ability to resolve first (raising Teemo to 4 might), then Mutation can be played afterward and will resolve before Discipline.

Sequence: (If Mutation is played after Teemo's ability resolves)

• Discipline is played and goes on the chain
• Teemo Scout is played, adding both the unit and its triggered ability to the chain
• Teemo's ability resolves, raising Teemo to 4 might
• Players can now add to the chain; Mutation is played targeting Ravenbloom to match Teemo's 4 might
• Mutation resolves, raising Ravenbloom to 4 might
• Ravenbloom's triggered ability goes on the chain and resolves, raising Ravenbloom to 5 might
• Discipline resolves, giving Yi +2 might and drawing 1 card

Nuances:

• Players are allowed to add new cards/effects to the chain after each entity on the chain resolves
• Whoever owns the topmost item on the chain gets priority to add new things
• Cards drawn during chain resolution can be played into the chain if they are reaction speed and you have resources
• Triggered abilities are base speed unless tagged otherwise