It's in A-tier for the front side alone
In the past with just Kuldotha Rebirth it usually wasnt worthwhile since your odds of drawing a Kuldotha Rebirth wasnt especially high and cards like Ornithopter and Memnite are pretty bad if they aren't turning into three 1/1 Goblin tokens, but now the odds are in favor of having one in hand every game
For my money Cosima is the best parent metaphor on a Magic card
This is how green gets good again in Standard, I think
Three Dog Vadrik Valduk Verazol Winota Zada Upgrades: Molten Duplication, Storm-Kiln Artist, Runaway Steam-Kin, Ruby Medallion, Crimson Wisps, Plague Myr, Simian Spirit Guide, Brightstone Ritual, Seething Song, Desperate Ritual, Deflecting Swat, Tibalt's Trickery, Chaos Warp, Pyretic Ritual, Mana Geyser, Twinflame, Jeska's Will, Blood Moon, Magus of the Moon, Defense Grid, Veilstone Amulet Zimone & Dina How To Upgrade The best way to upgrade decks is to playtest them first and then make adjustments based on your meta
Ive referenced this in several articles now, both as a showcase of reds recent progress and growth and as my own forever deck