3 Dark Confidant Emet-Selch, Unsundered Golbez, Crystal Collector Kefka, Court Mage Kefka, Ruler of Ruin Kuja, Genome Sorcerer Trance Kuja, Fate Defied Xande, Dark Mage
The Mycotyrant For a fungus and saproling typal deck, The Mycotyrant offers both power and synergy
That seems pretty insignificant in the face of potentially being able to overcome a disadvantage of going in first in battle, though
This is primarily because some of the statuses involve the random luck of coin flips, with a Pokemon sleeping and unable to act until you flip a heads, a Pokemons action replaced with damaging itself if you flip tails on the persistent confusion, but Paralysis and Poison at least avoid the random chance mechanics, Paralysis just being a single lost turn for the Pokemon and Poison inflicting gradual damage between player turns
Now, if you have Doubling Season out and then you proliferate, Doubling Season doubles those instances of placing counters onto your planeswalkers