While I think that youd want to be running a decent amount of targets to cast out of your graveyard, you definitely dont need to be playing a full-on spellslinger deck for it to be valuable
You should talk to Gandalf, Friend of the Shire again since wizards always arrive precisely when they mean to
He also plays around certain cards such as Elsa Spirit Of Winter, Anna Heir to Arendelle, and from the new set The Rise Of The Floodborn action card Im Stuck
Hades, Infernal Schemer (Enchanted) $251.73 Hades Steals The Spotlight Another reprint for the Fabled set that got upgraded to an enchanted, Hades, Infernal Schemer was a staple in The First Chapter, and with rotation added to the game, he's bound to see a lot more use
And Odyssey
A deck that has a lot of synergy but had a bad mana base and a bad mana curve will still be clunky and awkward