Jormungandr, World Serpent

When this card enters the battlefield, it is exiled
with five shackle counters.
On your upkeep, remove one shackle counter.
If Fenrir, the Shackled Plague enters the battlefield, remove the rest of the shackle
counters on this card.
When this card has no shackle counters on it, it
enters the battlefield.
The serpent that holds the world together. It is fated to
let go of its tail after Fenrir is released and begin
Ragnarok.