Ulrich of the Krallenhorde

If Ulrich is no longer on the battlefield as Ulrich, Uncontested Alpha's first ability resolves, the targeted creature won't deal or be dealt damage.

You choose the target of the Ulrich, Uncontested Alpha's first ability as it goes on the stack, but you choose whether or not to fight as that ability resolves.

Ulrich, Uncontested Alpha's last ability only triggers if a single player has cast two or more spells during the previous turn. If multiple players each cast just one spell during the previous turn, the ability won't trigger.