Spells and ops can be performed at the same time.
This is a screenshot of planetary infrastructure and space amazement:
I need to perform further testing to find the implications of this, but I used my evolve already for this account 
(EDIT: maybe this could be removed for dev?)
If you remove the ?only=… from the ops or spells pages, click on the magic spell’s form submit button and then modify the request body to add in the details of agent ops and agents to use then you can get both to send.
The request body for the above was:
agents=o_planetary_infrastructure&agents_a=10&magic=s_space_amazement&wizards_a=10&x=34&y=60&number=1&go=1&only=