Saber lo que se cuece

If Communal Brewing leaves the battlefield before its last ability resolves, use the number of ingredient counters that were on it as it last existed on the battlefield to determine the value of X.

The value of X is calculated as Communal Brewing's last ability resolves.

You don't have to choose any target opponents for Communal Brewing's first ability. However, if you do, and all of those targets are illegal as the ability tries to resolve, it won't resolve and none of its effects will happen. No players will draw cards, and you won't put any ingredient counters on Communal Brewing.