Aetherwind Basker

Abilities that trigger "whenever you get one or more {E}," such as that of Fabrication Module from the Kaladesh set, trigger only once as Aetherwind Basker's triggered ability resolves.

The triggered ability triggers both when Aetherwind Basker enters the battlefield and whenever it attacks. You don't have to choose only one.

Keep track of how many energy counters each player has. Potential ways to track this include writing theme down on paper or using dice, but any method that is clear and mutually agreeable is fine. (At higher levels of tournament play, dice may not be allowed for tracking counters that players have.)