The Crucible

Each player searches their library for 6 creatures,
those creatures enter The Crucible (Put those
creatures onto the battlefield under their owners
control, they don't cause abilities to trigger. During
a players attack phase, they may have creatures they
control in The Crucible fight other creatures in The
Crucible. Creatures in The Crucible can't attack or be
affected by anything outside The Crucible. When a
creature dies in The Crucible, exile it, the player with
last creature stand