This multi-creature lord is a fun build-around, especially in Commander when you can technically turn it into a second commander via its companion ability
If you care about fixing for multiple colors and getting elementals into play, or want an extra creature lying around, you can probably play Llanowar Loamspeaker
Cards like Unruly Catapult, Galvanic Juggernaut, Traxos, Scourge of Kroog, Staff of Compleation, Bender's Waterskin, and the game changer, Mana Vault all have ways to untap themselves
While the deck is already good, Mardu (red/white/black) has plenty of useful support cards for the strategy that make it a great base deck to upgrade over time
If you send a monster that is LIGHT from his original attribute DARK to his GY with the effect of Subterror Succession, you can add his LIGHT monster from the Deck to your hand