Skins are alternate looks for your Champions that you can swap in and out whenever you want!
Feats are small, Champion-specific buffs that can be unlocked and assigned to your Champions. They offer an additional level of customization for your favorite Champions — and may even provide some new formation opportunities!
In this pack:

Unlock for the Champion Aila (if you don't already have her)
Valkyrie Aila Skin
Aila's Storm Warden Feat
7 Aila Gold Event Chests
1 Guaranteed Shiny Equipment Card