You should also pack plenty of ramp into your cast-from-exile deck
Rhystic Study and Mystic Remora either tax or punish opponents for casting spells, both of which will be of great benefit to you
Dont let that discourage you from building a deck around it if you like
Additionally, Slimefoot causes each opponent to lose one life and for you to gain one life whenever a creature you control dies, synergizing greatly with the sacrifice-heavy strategies that are sped up by the disposable tokens Slimefoot can produce
The Final Fantasy versions dont quite have the statlines to dominate developed boards, but they still give every deck a reasonable late-game punch basically for free while reducing the rate of mana and color screw
I am obviously talking about Delver of Secrets with its three incarnations, RUG, BUG, and U/W/R