Umbris, Fear Manifest Umbris, Fear Manifest stands out as an incredibly unique Dimir card as one of the few dedicated payoffs to both exiling cards and nightmares
Don't forget that you can sacrifice Saprolings to give Nemata +2/+2 this turn and with the trample this gives that's a Commander Damage kill out of nowhere
Enchantments and red don't mingle much
An aggressive white deck full of powerful legendary creatures like Daxos, Blessed by the Sun , Skrelv, Defector Mite , and Kytheon, Hero of Akros would be excellent to pair with Senu
6 Mentor Of The Meek About As Good As It Gets For White Card Draw White is one of the worst colours when it comes to drawing cards
We've got one commander who uses lands for power, one for resourcefulness, and one for defense