Forum:Need Help With Rulings!

... alright, so i was playing my friend today, i was using my red eyes based deck, and he had a low level, or little city deck... I summon red eyes successfully and on my end phase, he activates mask of restrict which doesn't allow tributing...

my turn, i'm gonna summon red eyes darkness dragon and he says i cant, because of mask of restrict.

SO, can mask of restrict negate it? because i think darkness dragons effect is by special summon...

which one is it? and would i still have been able to play him?

PLEASE RESPOND!!