The Greenwarden is even better in Commander where the singleton format makes Regrowth type (getting any card back from the yard to your hand) effects even better. It’s likely that you will see this in most green ramp decks going forward. It’s better that Deadwood Treefolk, which also costs 6 mana (5G) but only gets creatures, plus you don’t have to deal with the pesky Vanishing 3. It’s definitely a worthy upgrade unless you’re playing a Treefolk Tribal deck (which is fairly decent, actually.)
How would you use Greenwarden of Murasa?