If Red Darius is played and then Challenge is played, does Darius's trigger get added to the chain on top of Challenge, resulting in Darius having 7 might when Challenge resolves?

Ruling: No, Challenge resolves first, and Darius's might increase only triggers after Challenge has resolved. Darius will not have 7 might when Challenge resolves.

Sequence:

• Play Darius
• Play Challenge (Challenge goes on the chain)
• Darius's trigger goes on the chain on top of Challenge
• Darius's trigger resolves first (increasing his might)
• Challenge resolves second (readying and buffing Darius based on his current might)

Nuances:

• Cards are considered played after resolving, which is why Darius can ready himself when played as the 2nd card in a turn