I posted an idea about a new ability in some other forum post, but it may be an interesting Leader
Null. Depending on Null, they would nullify different abilities/bonuses
Null: Power - All +/- power abilities and bonuses nullified
Null: Damage - All +/- damage abilities and bonuses are nullified
Null: Life - All +/- life abilities and bonuses are nullified (includes heal and poison)
Null: Attack - All +/- attack abilities and bonuses are nullified
Null: Abilities/Bonuses - All abilities and/or bonuses are nullified (including your own)
If Null: Abilities/Bonuses was a card, it may even promote some rainbow decks if it was Null: Bonus
I suggested these as an ability because they're very situational. If it were a Leader
, I would only see Null: Abilities/Bonuses making it, and only if they nulled both your abilities/bonuses along with your opponents.
Note: The abilities/bonuses are nullified and not stopped, so even against cards like Stop: +x attack would be nulled (or not activated at all, since they're not stopped). If they are however stopped, and you had Null (Say you were using Roots
and had the Null ability), they would still be nulled.