Does the 5 drop red Darius unit read itself if it is the 2nd card being played in a turn?

Ruling: Yes, the Darius unit reads itself when played as the 2nd card in a turn.

Sequence:

• The card is played and fully resolves
• The unit enters the board
• The "play" ability triggers
• Since the unit is now on the board, it counts itself

Nuances:

• "Play" abilities trigger after a card has been played (fully resolved), so the unit is already on the board when its ability triggers