If you're going to devote a deck to your favorite card (Nice choice, mine's Soulcatchers' Aerie), I would go all in. For example, in Dimir, Mana Skimmer is the Timeshifted version of Somnophore.

Time of Ice, Quiet Contemplation, Back to Basics, Dream Tides, Wrath of Marit Lage, Temporal Distortion, Neko-Te Thalakos Dreamsower, Wall of Stolen Identity, Frost Titan, Queen of Ice, Wall of Ice, Niblis of Frost, Guardian of Tazeem, Icefall Regent, Dungeon Geists, Mesmerizing Benthid, House Guildmage, Tidebinder Mage, Watertrap Weaver, Frost Lynx, Stitched Mangler, Fogwalker, and Vertigo Spawn would probably be my picks for "freeze" tribal.

Alternately, if you're not invested in Dimir, so much as in the creature itself, you could build a Derevi, Empyrial Tactician, or Empress Galina deck, since those commanders probably best represent what the card is doing.

triproberts12 thanks for those suggestions!

I had no idea about Mana Skimmer and will definitely put that nightmare in! I have a few of the ones you named but Time of Ice is a solid recommendation. It'd work well in case I don't get much out - really great pairing with Orb of Dreams by bouncing them back at the end too. Dream Tides is tempting but it would slow down my deck more than it already is. I forgot about Thalakos Dreamsower, might consider putting it in for the mid-mana cost. Queen of Ice is also a solid pick. I'll look into all of these, thank you!

Side note, when I first started learning magic, I had half an idea of making a white/green bird deck. Your favorite card just might inspire a black/green/white dredge deck with birds.