During one of our first design meetings, I talked about all the restrictions I explained above
Biotech Specialist Biotech Specialist is a huge sacrifice payoff that turns artifact tokens that are already destined to get sacrificed into a win condition as a Shock to the face
If it leaves the battlefield, the game object ceases to exist
Faithless Looting (red, 1 mana): Draws two, discards two, with flashback for a second use
A couple of standouts are Teferi, Master of Time who will quickly become BFFs with Sefris given a chance, and Enduring Renewal, which we can play out once we have a creature or two in play and ensure we draw straight through to our lands/noncreature interaction every turn thereafter
On top of greens already solid ramp, there are lots of cards like Marwyn, the Nurturer, Gyre Sage and Rishkar, Peema Renegade that work with this theme specifically to make dizzying amounts of mana