If Darius is in a battlefront and an enemy enters that battlefront, does he get +2 attack if I play 2 reaction spells during the opponent's turn?

Ruling: Yes, Darius gets +2 attack if you play 2 reaction spells. His trigger is available to activate regardless of whose turn the spells are played on.

Nuances:

• The trigger works on any turn, not just your own
• Each reaction spell played will trigger Darius separately