A Simic deck could run Flooded Strand, Scalding Tarn, and Polluted Delta to search up islands, for instance
Each will be featured twice, once with their specific new art for all the cards (except basics), and once with the cheapest version available of each card, to get a better idea of the deck price and value.
Kefkas ability to wear down your opponents while helping you keep a steady supply of new cards feels extremely relevant to the current midrange meta in cEDH, although Im not sure that he will outperform Tymna the Weaver // Kraum, Ludevics Opus
They make blue-black extra hard to fight against because you're never quite sure where the danger lies
Instead, you can cast Fireblast without paying its mana cost if you sacrifice two Mountains
You should be able to swing with an 8/8 reliably without worrying about dying in combat and losing your recursive Vindicate