If my opponent uses Gust against my 3 might unit, I use Discipline to save it, and then my opponent reacts with Shakedown that kills my unit before other spells resolve, do I still draw from Discipline?

Ruling: Yes, you still draw from Discipline even if the target unit is killed before Discipline resolves. All effects that reach the chain always resolve (unless countered), and you do as much as you can on resolution.

Sequence:

• Effects are added to the chain with targets declared when finalized
• Chain resolves in reverse order (last in, first out)
• Each effect resolves doing as much as possible
• Non-conditional parts of effects (like "draw 1") always happen even if targets become invalid

Nuances:

• Fizzling does not exist in Riftbound - effects always resolve unless countered
• "Then" vs "to" matters: "then draw 1" is not conditional, but "to draw 1" would be conditional
• If an effect says "its owner draws" and the unit dies, you cannot draw because the owner cannot be established when off the board
• Exception: If the spell itself killed the unit, that spell can look back to establish the owner
• Targets are declared when effects finalize and cannot be changed (unless a card explicitly allows it)
• If a target becomes invalid, effects that reference that target will "whiff" (resolve to no effect), but non-conditional parts still resolve
• You cannot block reactions - counters can target any legal item on the chain at any time while the chain is open