Garfield declined that offer
Where Kari Zev will truly shine is if there is a good way to take advantage of the extra creature she creates each time she attacks, maybe by having a Yahenni, Undying Partisan and Zulaport Cutthroat on the battlefield
Happy Little Gathering Evolving Wilds Sacrificing Evolving Wilds to fetch a basic land has long been one of the simplest and most reliable ways to fix mana
A nice backup win condition I like as well is Magistrate's Scepter + Tekuthal, Inquiry Dominus + Contagion Engine for infinite turns (if Scepter has a charge counter on it, activated the Engine to put 4 more counters on the Scepter then activate the Scepter to take an extra turn and repeat this infinite times)
Additionally, its effect became even better over time with the introduction of Urzas Saga and the metagame shifting towards more artifact-heavy synergies
The app takes advantage of the virtual nature of the cards by expanding the cards' artwork beyond the physical space