Jacekw-Bulldog idea is to have constantly - for example daily - changing rulesets. This could be for example:

• Today Death has +2 melee attack on all melee monsters
• Tomorrow Life ranged monsters got True strike ability
• Some other day taunts are not taunts and 1-mana monsters have magic reflect
  ...and so on.

Contrary to human player's fears of bots being super-intelligent AI beasts they are nowadays more like statistically well-performing build-ups for each splinter. So they are just databased or spreadsheeted compilations to existing rulesets. If ever-changing rulesets are introduced to gameplay this approach will lose value / strength because bots should be capable of adapting. This would favor human players and actually make the game play more entertaining / funny :)

Of course in future we might have AI-bots that are able to adapt fast but for the spreadsheet bots this approach might prove to be challenging.