Adding it to Azorius makes sense since White taps things and Blue untaps with Vizier of Tumbling Sands
Also land upgrades
[6] Transformers consists of fifteen double-faced cards, each of which is a Legendary Artifact Creature on the front and a Legendary Artifact with the Vehicle subtype on the back (with the exception of Soundwave and Blaster, who lack the Vehicle artifact type for obvious reasons)
So, if some triggers go off between the resolution of Sundial of the Infinites ability and the beginning of the cleanup step, including those that trigger at the beginning of cleanup step, they all go onto the stack, the active player gets priority and then the usual chores
If you have another spell you want to cast but need more lands, cast Rubble to reset three of your lands to keep your turn going
And since a Background is basically a second commander (in enchantment form), you should definitely pair one with Gale