The main reason Zirda, The Dawnwaker was banned was due to the indefinite mana loop that occurred when combining the card with the Grim Monolith companion card
Below, you'll find a short bio for every new legendary card revealed from Commander Legends so far
Plenty of cards draw and recur creatures, and those all get better with new split creature/spells in the pool
Power creep shows Prosshs age nowadays, but the card can still pull off a two-card infinite mana combo with Food Chain
If you fetch one land with it, it's a bad Cultivate, two lands and it's a better Explosive Vegetation, three+ lands and you're heading straight into valuetown
As a Commander, shes not providing enough card advantage, I think, to be buildable