MArcomage

This card costs way too much for its current effects. I'm not a fan of rares that help your opponent...

Instead, this card should cost about the same, but only affect you (+25 tower and +1 facilities). Otherwise, this should be a 0-cost card.

Or, like Magic rift, add a malus to your opponent.
Something like Enemy stock -10?

Something like that might work, but for the name of the card, I think it should only be beneficial to you. Giving it a Holy keyword might be a good idea too...

Why a Holy keyword? "Enlightenment" generally refers to reason and logic, things that don't always get along with established religion.

From a historical standpoint, ages of enlightenment generally involve populaces taking steps forward and abandoning old ways, often with nations benefiting together from one another's discoveries and a general proliferation of new ideas. It does make sense that this card would benefit both players. It is odd that it should have such a cost when the gains are equal for both, however.

I suggest either make this a zero-cost (or very low cost), or do as suggested above and destroy enemy stock.