Gnarlback Rhino's last ability triggers when you cast a spell that has multiple targets as long as at least one of those targets is Gnarlback Rhino. It doesn't trigger multiple times if you cast a spell that targets Gnarlback Rhino multiple times.
Gnarlback Rhino's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. YW Tang
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