Infinite storm count
This was founded after Wizards took over management of the format from the Commander Rules Committee, who had been the target of harassment after one particularly controversial banlist decision
But if they could either Switch or DCE retreat the Eel somehow, and odds didnt seem improbable, I would Catcher the Mewtwo and go for the 62.5% instead
One of these will be shockingly good in Standard, to my chagrin, but Ive got serious doubts about some seemingly popular cards like: Dragonhawk, Fate's Tempest Eluge, the Shoreless Sea Glarb, Calamity's Augur Helga, Skittish Seer Hugs, Grisly Guardian Mabel, Heir to Cragflame Muerra, Trash Tactician Vren, the Relentless Wick, the Whorled Mind So yeah, most of the story arc cast is underwhelming
Chatterstorm is great for similar reasons, though its limited to sorcery speed, so you wont take advantage of a spellslinging opponents turn