Do reactions take priority over actions and unit abilities in resolution order?

Ruling: Base speed, action, and reaction only determine when you can play something, not the order anything resolves. The order things resolve is Last In First Out (LIFO) off the chain - the last thing to go onto the chain will be the first thing to resolve.

Sequence:

• When combat starts, the chain is initially populated with "when I attack" triggers
• Then "when I defend" triggers are added
• Then both players can play reactions
• Once everyone passes, the chain starts resolving with the latest played item first

Nuances:

• You cannot play an action after an ability has already gone on the chain
• If multiple cards are discarded simultaneously, you choose the order their effects go on the chain