[SNC] Scheming Fence doesn't allow you to use any type of mana to activate ability

Ran into a scenario where Scheming Fence couldn't activate an ability it shut down because it didn't have the correct type of mana.

Here's a scenario where I had 2 Scheming Fences, one naming Evolved Sleeper, the other naming Warden of the First Tree. I was able to activate the ability stolen from Warden of the First Tree because I had white mana available, but could not activate Evolved Sleeper's ability.