If my commander is four or five colors, and it is not light on creatures, I will play Bonders Enclave
The draw mode, especially, feels bad
Anim Pakal, Thousandth Moon Anim Pakal, Thousandth Moon rewards you for building around it with cards like Luminarch Aspirant or Rosie Cotton of South Lane to stack +1/+1 counters on it
Would I recommend three decks as the number for your whole collection
If you want this sort of effect to influence domain, you need to look for text that actually gives your lands additional basic land types, as seen on Dryad of the Ilysian Grove and Prismatic Omen
When the equipped creature attacks, you can create two 1/1 spirit creature tokens with flying, and if the creature is legendary, thse tokens enter attacking