Look, theres nothing wrong with Rampant Growth, a card that sees play in Casual EDH and rarity-restricted formats, and Shared Roots just gives us more of that
Tyranid Swarm - Universes Beyond: Warhammer 40K Ive had games that have been won because my Haruspex has gained so much power that it deals huge damage to opponents, or converted its power to mana for a big late-game push
These are slightly more expensive, but they synergize well with your strategies of ring temptation and lifegain, and they also just fit the theme of the deck
Land Tax keeps your hand full, guarantees land drops, and turns whites ramp problem into a resource engine
Theres a pretty solid mixture of all the colors in this deck, though possibly a bit more white and green thanks to the enchantment support