DND_Reborn
The High Aldwin
As it was my thread/poll, I, personally, don't mind the necro. 
I didn't know there was a declaration phase, and wouldn't have used it if I had.
RAW there is not
There wasn't technically a "declaration phase" as such in 1e, but since actions affected initiative (charging, weapon speeds and multiple attacks, weapon attacks vs casting spells, etc.) deciding what you were doing was part of rolling. If you were going to cast fireball, for example, whether your spell was completed prior to being attacked, or if you were attacked while casting, or even if you were attacked before you stared your spell, all depended on your initiative roll and the fact you were casting fireball.RAW 5e, there is not. I do believe this was RAW 1e, IIRC.
I suppose it depends on how rigid and detailed your declarations have to be and the table you are at...

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.