Card states: While this support is on the board your creatures get Haste. Nothing about tokens, casting, or enter the battlefield effects.
But if you use Connive and grab a creature it does not get haste. Zombie creatures summoned by Nicol Bolas, God-Pharaoh also do not get haste from Mirror March.
They are excluded from the second part of the card but as worded should get Haste.
//Edited Title - Tombstone