Dionus Elvish Archdruid + Ancient Imperiosaur

When resolving "This creature enters with two +1/+1 counters on it for each creature that convoked it.", If I tap a elf twice for the convoke cost(due to Dionus's ability) does that count as two separate creates convoking or does Ancient Imperiousaur only see the one creature?

Apologies if I did not word that well.