At the moment, it's okay to bring Thunderlord's Decree on everyone. If you're playing support and don't want to, though:
Champions it's okay to bring Windspeaker's on as an AP-support:
Champions NOT to bring Windspeaker's on as a Mage "support": 
Your "AP support" mastery page that ends in Windspeaker's is not the one to bring on champions with _no heals or shields. _
Catastrop1 votes
with Windspeaker's. I just cringe everytime.
The Ecdysiast1 votesThat shield though.
Jas3Bae1 votesI'm surprised this is even an issue.
The Ecdysiast1 votesHad a Brand player in my last game with Windspeaker's, who still played for kills. Only started getting assists at the point his damage fell off. Would've been better to just go for Deathfire touch and queue as Mage instead. It's the most annoying thing when someone lies about their role on Team Builder.
Hedgehog Hustler1 votes
with windspeaker's though?
15% more chronoshifting Power