This would be a new game mode, a cross between Underworld and Hero Challenge. The player would be pitched against an AI-controlled opponent and both teams would pick 4 creatures to start. Each side would have 3 lives and can win by either destroying their opponent’s wall 3 times or by exhausting their opponent’s creatures. Each creature would become exhausted after doing or receiving a set amount of damage and another creature of the same colour would then need to be picked to replace it (probably from a choice of 2). Unformed creatures taking damage would count also (otherwise it would be hard to eliminate creatures like Gloomfang). Exhausted creatures could be ‘hot swapped’ for the new creature, with the same wait time and strength as the creature they are replacing. This would be a good way of encouraging diverse teams as well.