Jaxoli, Devourer of Titans

Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters
the battlefield with twice that many +1/+1 counters
on it.)
Whenever Jaxoli, Devourer of Titans attacks,
you may search your library for a creature card,
put that card onto the battlefield under your
control tapped and attacking, return that creature
to its owners hand at the beginning of the next
end step.