Varys on Varys..

[DevlinBrightblade]

So scenario, you are playing NCU's Walder Frey and Varys, your Opponent is also playing Varys as an NCU, on your activation you announce to play Walder Frey, your opponent uses Varys to block Walders Ability, but can you then play your Varys to block your opponents Varys's ability?

[Alliser Thorne]

Varys is only used when an enemy NCU activates.

Their Varys is not activating, so no.

[Codfather]

So scenario, you are playing NCU's Walder Frey and Varys, your Opponent is also playing Varys as an NCU, on your activation you announce to play Walder Frey, your opponent uses Varys to block Walders Ability, but can you then play your Varys to block your opponents Varys's ability?

If your opponent uses their Varys to grab a zone before you've gone with your Walder, you can use your Varys to turn off the enemy Varys for the round, which would mean your Walder can activate unthreatened