Let's say you have a split attack that has a block zone on the foundation side. Can you still use Wind Dance on the attack side despite the block zone being on the foundation side?

Ryken said:

As long as the block on the foundation side matches, yes.

To clarify, from the AGR:

"2.6.3.2 If there is a block on a split card, both sides are considered to have the same block. You must declare which side of the card you are blocking with when it is played."