Harbinger of Leviathans

When Harbinger of Leviathans enters the battlefield, you may search your library and/or graveyard for a nonlegendary Leviathan creature
card and put it onto the battlefield with five -1/-1 counters on it, if you searched your library this
way, shuffle it.
At the beginning of your upkeep you may remove
a -1/-1 counter from a creature summoned with Harbinger of Leviathans.
I do not command the beasts, I simply bring forth their
rage upon those unworthy of Antels Voice.