Just pick a legend you enjoy and play.
The deck is made up of seven different monsters, which all had their own personalities in the series, and they all contain a similar ability: When theyre destroyed by battle or card effect, they can go to the Spell & Trap Zone as a face-up Continuous Spell rather than go to the graveyard
it gives you an extra land drop every turn, which is exactly what these decks need to do their thing
This already works well with the handful of zombie-synergies in Kaldheim (Narfi, Betrayer King, Draugr Necromancer, Draugr Recruiter, Priest of the Haunted Ridge), but even if you're not after opponents' braiiiiinsss, options abound
The big name in Greens Legacy was Multani, as in the legend Multani, Maro-Sorcerer, the */* that couldnt be the target of spells or abilities and had power and toughness equal to the total number of cards in all players hands