Advent of the Endbringers

{7}: Put an Opponent counter on Advent of the Endbringers.
When the first Opponent counter is put on this
card, create a 3/9 colorless Endbringer token with Flying and Hexproof.
The second, create a 6/10 colorless Endbringer
token with Double Strike. The third, create a
12/12 colorless Endbringer token with
Annihilator 4. Then exile Advent of the Endbringers.