cr:4.5.4d

The game is a draw for the remaining players if a stalemate occurs. A stalemate happens when no remaining player can legally advance the game state toward ending the game.

Example: There are 2 remaining players. Both players only have a Cracked Bauble in their hand, no cards in the arena, or cards in their deck, arsenal, or banished zone. Both players control a weapon without an attack ability or an ability that would reduce life totals, so they have no way of advancing the game state to a conclusion. Therefore the game ends in a draw because both players are stalemated.