Hoard Fight - Gregar

This games starts with Gregar, Phyrexia's Perfect, planeswalker on the battlefield.
Any effect other than damage that would remove counters from Gregar, or any effect that would make Gregar leave the battlefield, is negated.
If the Hoard deck would be cast from while there are no cards left, shuffle all cards that belong in the hoard deck that are in a graveyard or in exile, then cast the top card.
When no counters are left on Gregar, each other player wins the game.