Simple deck I threw together today with the release of RNA on MtG: Arena. It's basically Elfball plus the crazy Jellyfish Hydra Beast refilling your hand and replenishing your health. Needs a lot of refining, I'm considering adding an Immortal Sun, but it might too lategame. Deck snowballs hard when unchecked like Elfball does, but probably collapses to good removal. Simic Ascendancy is actually possible to pull off when played lategame with multiple Hydroid Krasis, but I don't think it's actually practical in most cases.
https://mtgarena.pro/decks/simic-ramp-bbfd67bc-fa32-45bb-93ec-28bfb53409c6/
2 Hadana's Climb (RIX) 158
8 Island (RIX) 193
8 Forest (RIX) 196
2 Simic Ascendancy (RNA) 207
4 Hydroid Krasis (RNA) 183
4 Llanowar Elves (DAR) 168
4 Incubation Druid (RNA) 131
3 Druid of the Cowl (M19) 177
2 Marwyn, the Nurturer (DAR) 172
2 Dive Down (XLN) 53
3 Breeding Pool (RNA) 246
3 Hinterland Harbor (DAR) 240
4 Incubation // Incongruity (RNA) 226
4 Growth-Chamber Guardian (RNA) 128
3 Beast Whisperer (GRN) 123
2 Applied Biomancy (RNA) 153
2 Frilled Mystic (RNA) 174