Spend 5 and then leave the rest of your mana ready for a land drop and cast
The Factory also taps for colorless, arrives untapped, and then taps for 7 mana and makes a 2/2 token dork which is a Saproling with the Nexus, or just can be sacrificed to Attrition or Vampiric Rites or to chump block, or to double with Doubling Season effects
Subtlety acts like a counterspell on legs that pushes away crucial creature or planeswalker spells
Put the exiled cards on the bottom in a random order.) Enchantment Omnath, Locus of All If you would lose unspent mana, that mana becomes black instead
But, while commanders tend to serve as central pillars for decks, two decks built around the same commander can be completely different, based on the choices made when brewing them