Touch Ethereal Realms
Events
Unit - A unit Starts the effect of an ability
Conditions
(Ability being cast) Equal to Touch Ethereal Realms
Actions
Player - Set the current research level of Touch Ethereal Realms to 1 for (Owner of (Triggering unit))
Wait 5.00 game-time seconds
I would create a dummy spell, it would enable that research for 5 seconds but... i dunno how to remove it after the 5 seconds.