Id want to add Delayed Blast Fireball, Wild-Magic Sorcerer, and Nalfeshnee, plus combat tricks that cantrip, like Expedite, Crimson Wisps, and Might of the Meek, to help draw and exile cards
Thanks to the rounded down wording, your opponent is always left with at least one creature, so they can always keep their best creature alive
Pay eight , Exile Gonti's Aether Heart: Take an extra turn after this one
Kodama's Reach, for example, is a $1.25 here and that's a dollar more, so for my budget decks where my budget is coming in around $32 that's a real thing
With that in mind, I could see Zell easily finding a home in a Gruul or even Red/Green/x Commander deck that wants to play lots of lands that provide additional value beyond simply tapping for mana
For just [1W], you can swing for 30 damage, but if Keldeo ex moved from the Bench to the Active Spot that turn, the attack jumps up to 120 damage