Silence them away with a little Gruul decimation
We do know that Avatar: The Last Airbender features allies, and WotC wants their Standard archetypes to have some support across its sets, so this feels like a layup
Plus the special versions can only be gotten from expensive Collector Commander decks or these special 2-card packs
Not overly, yes hand disruption doesn't scale brilliantly and yes, this does tend to scale a little worse than most of the other decent ones but not nearly enough to stop it being great
A creature or planeswalker on your opponent's side is gone just by casting 3 black mana, then you can turn around and exile this creature to get a Zombie token in return
Using the Tenth Doctor card showing David Tennant in the role gives players access to the Allons-y! ability, that allows players to exile nonland cards from their deck and place time counters on them, and the Timey-Wimey ability, enabling players to time travel at the cost of removing time counters from their cards
