Apologies if this is an obvious answer, but i expected to see a rule preventing a +2 bonus to spellcasting and it shocked me

A wizard that's on a special mount (war altar, cauldron of blood etc) can get a special +1 bonus once per game to cast a spell. If you equip that wizard with the Wand of Power, can you use both +1 bonuses in the same turn?
My gut instinct says you can't. But i've read through the rulebook and the FAQ sheet i have, and i can't find any rule that prevents it.
So, is +2 possible?