Chainer, Nightmare Adept did not give creatures haste that entered with Rise of the Dark Realms
first i cast Chainer, Nightmare Adept. Then I cast Rise of the Dark Realms. 34 creatures entered the battlefield, and I did not cast them from my hand, so they should have had haste. There were no effects on the battlefield that would have prevented it. I don't know what creatures all ETBed, as everyone scooped and I didn't have time to look at them all, but I was playing against a mono-red deck, and 2 Dimir decks, and I was playing a Rakdos deck. Nothing that came in prevented the Altar of the Brood triggers, so I don't think they would have stopped the Chainer triggers either.