Does Darius's ability trigger based on when a card is played (resolves) rather than when it leaves your hand, meaning the order is determined by stack resolution?

Ruling: A card is played when it resolves, not when it leaves your hand. Darius's ability triggers based on resolution order on the stack, so the second card to resolve (even if third from hand) triggers his ability.

Sequence:

• Darius is played first
• You play a spell (goes on stack)
• Enemy plays a reaction (goes on stack)
• You play a reaction to their reaction (goes on stack, resolves first)
• Your reaction resolves as the second card played, triggering Darius
• Darius readies and gets +2M before the opponent's spell resolves

Nuances:

• Your opponent could theoretically react to the trigger of Darius's ability