Argagarg
Brief Discussion
Argagarg is generally placed with 
, in the upper tiers but not top-tier. He has strong matchups against a number of the cast, primarily due to the limitations of the other kits to deal with his extremely strong ace-block and counter.
His most glaring weakness is a weak match-up against Gloria, as she effectively neutralises all of his kit with her fast recurring pokes and healing abilities.
Consensus Changes
Bubble Shield is easily the strongest block in the game, and gives Argagarg a very safe advantage time which Rook specifically struggles to end. Slightly nerfing Bubble Shield to end on all hits brings it in line with Long Range and (reworked) Temporal Distortion. It also gives Rook additional outs through his special blocks.
In addition to a general nerf, Argagarg also needs to have some way to counteract 
. The most commonly suggested way for this to be implemented is to buff Bubble Shield to prevent healing effects.
A* Bubble Shield [During Combat]
If this blocks an attack or Joker, draw a card and this gets: Ongoing. Your Hex of Murkwood deals an extra 2 damage per turn and prevents the opponent gaining life. When you get hit by an attack or throw, take no damage, end combat and discard this.