The Unspeakable Swarm

Cryptid ( it has no creature type), Flying, Flash,
Infect with Madness ( as Infect but it places
Madness Counters instead of Poison Counters).
When The Uspeakable Swarm leaves play, exile it.
{u/b}{u/b}{u/b}{3}: Place The Unspeakable Swarm from
exile to the battlefield.
When the Collectors Planeswalker Agents faced
the things, they repelled them without understanding their abhorrent nature.