Resurfing Horror

Trample, Menace, Reach, Unseal 5
At the beggining of your chosen opponent's
upkeep remove a pact counter from Resurfing
Horror; if resurfing horror has no pact counters
while in exile, return it to the battlefield under
your control at the beggining of your upkeep.
It lurks under the depths, waiting for it's deranged followers to call upon it once more.