Hollowhenge Overlord | Primal Vigor

Cards

At the beginning of your upkeep,
Hollowhenge Overlord triggers, creating four 2/2 Wolf creature tokens for each Wolf and/or Werewolf you control due to
Primal Vigor and
Doubling Season.
Repeat step 1 during each of your upkeeps. You'll create exponentially more Wolves each time assuming the Wolf tokens survive.

The number of Wolves and/or Werewolves you'll control after performing steps 1 and 2 is equal to 5^X * Y, where X is the number of iterations of those steps you've performed (starting at 1), and Y is the initial number of Wolves and/or Werewolves you started with. So if you start with 6 creatures, you'll have 30 after the first iteration, 150 after the second, and so on. This also assumes no Wolves and/or Werewolves die, and no more are created during the turns.

This combo has been estimated to be Exhibition (Bracket 1+).