Crux of Fate [Dragon deck]: Perfect in the dragon deck
Playing aggro decks in Commander can often be difficult due to how unfriendly the format can be toward creature-combat based win conditions
Kangee, Aerie Keeper Kangee, Aerie Keepers value hangs on how many feather counters it has, and thus how strong other fliers are beside it
Since Urborg, Tomb of Yawgmoth makes all lands into Swamps, so long as someone at the table has a copy in play, you can recur Bubbling Muck and untap lands as often as your cards will allow before casting a spell like Exsanguinate or Torment of Hailfire to win
This is a good one, since it fuels you to play more cards for cheaper as well as buffs up the rest of your board without having to stack too much up on other things
Plus, as a doctors companion, K-9 can partner up with any Doctor commander for additional flexibility