This is usually because other decks have become more powerful and are now capable of dealing with the banned cards
He can quest for a huge 4 Lore, which you could buff with Songs and Locations, and then just defend him with other characters
Everlasting TormentEverlasting Torment - 16,477 decks Super Soul-Scar Mage stapled to Screaming Nemesis dropped in the latest Commander set, and for just three mana and on a difficult-t0-remove card type
This adds up in a hurry, especially with sacrifice fodder like Gravecrawler available, making Grimgrin a massive, deadly attacker
Five adventure lands, which are also towns
It can take cheap equipment like Sword of the Animist and fly in to get combat damage/attack triggers with them