FunOrb/YMMV


 * Excuse Plot
 * Game Breaker:
 * Conductor Rod in Arcanists before it was nerfed.
 * In Armies of Gielinor, it used to be possible to block the opponent's portal by parking a flying unit on top of it--potentially locking them out of summoning units for the rest of the game if they lacked a ranged unit to attack it. Portals have since been updated to deal damage to enemy units that camp on top of them.
 * Those with a decent knowledge of mathematical theory may realize