This is a horde deck, meant for multiplayer games.

A Horde deck is a 100-card deck. 60 of the cards will be tokens, 40 will be actual Magic cards.
The player(s) take their turns at the same time. They don't share mana pools, but attacking and blocking happens at the same time and are coordinated; the Horde attacks the assembled players, not individual players. Each player contributes 20 points to the group's life total, so 3 players will have a life total of 60.
The player(s) get three turns to set up before the Horde deck takes a turn.
The Horde deck has the following rules:
Each turn they turn over cards from the top of their deck until they turn over a non-token.
They have infinite mana and will cast everything.
Choices will be made as randomly as possible (though the deck should be built to avoid having to make choices).
All Horde creatures have Haste and "this creature attacks each turn if able."
The Horde deck has no life total. Every damage taken results in a card being milled from the deck to the graveyard.
The Horde deck cannot gain life in any way.
The Horde cannot search its library for any reason.
The Horde will always attack players, not Planeswalkers.
The Horde has no hand, so any spell which directs that a card go to its hand [either] fizzles [or] sends the card to their graveyard [or] sends the card to their library in random order [or] sends the card to the top of their library (take your pick).
The Horde deck loses if it has no cards left in its library. The Horde deck wins if the players' life total is reduced to 0 or below. There are no other win or loss conditions.