Can Vi (Destructive)'s activated ability be used multiple times in a single turn, and can it be used during a showdown?

Ruling: Vi's activated ability can be used multiple times on your turn, but only at base speed (not during showdowns, and not at reaction or action speed).

Sequence:

• Activated abilities like Vi's can only be used on your turn
• They can only be used at the same speed as base speed spells
• You can activate the ability multiple times before passing priority
• You cannot use it during a showdown

Nuances:

• The ability cannot be used at reaction speed or action speed