Kicker cost and Monstrous Vortex
Buddy is building an Eldrazi deck, he wants to have [[Monstrous Vortex]] on the field and is debating putting in [[Voidpouncer]]. We are not sure if the +1/+1 counters count as a 5 power creature since the counters aren't on the board until it enters, but we can see otherwise.
We saw this post: https://www.reddit.com/r/mtgrules/comments/1gwvfws/monstrous_vortex_and_slinza_triggers/
and are not sure. So would vortex go off if you cast the kicker?