Clay Champion is not giving buffs when the conditions are met, regardless of whether it was a green swap or a white swap. His abilities are not triggering.
Sigh, I never play with any cards from a new set for the first month because this happens so often.
And buffs are one of the most frequent bugs
I wholly expected this to say the ETB buffs replaced the previous buffs, per the usual problem
@Gunmix25 Both buffs are working for me. Green to buff the champion himself and white to buff other creatures.
@Gunmix25 (and everyone else) this is why it’s important to submit videos when reporting bugs
This vid does double duty: It shows CC not buffing and it shows Toluz working
And here is a video of it buffing itself but not other creatures
@Fireguy - because so many cards are bugged that I don’t want to loose matches to some bug or card that works differently from the expected.
I rarely preplay my deck designs, so I prefer someone else find the bugs for me.
I’m a damn fool - and very glad I recorded those videos for this.
It’s not buffing because the last sentence says you have to match the respective color for that buff to trigger. 
Hello guys,
Thank you for all the information provided, this issue will be investigated!
If you have any additional information that you consider relevant, please don’t hesitate to send me 
Rebeca.