Lets get to it, starting with one of the most degenerate sets of all time: Urzas Saga Significant cards on the list: Argothian Wurm $3 Gaeas Cradle $70 Gilded Drake $30 Karn, Silver Golem $4 Lifeline $4 Lightning Dragon $3 Morphling $10 Serras Sanctum $20 Tolarian Academy $25 Temporal Aperture $2 Time Spiral $25 Yawgmoths Will $15 Of these, only three can fairly be called tournament staples: Gilded Drake, Serras Sanctum, and Time Spiral
Siona Aura Combo While Light-Paws, Emperor's Voice and Bruna, Light of Alabaster are the two best Aura Voltron commanders, Siona, Captain of the Pyleas is the greatest Aura Combo commander: she is part of a 2-card combo with Shielded by Faith to make infinite creatures, and it's incredibly easy to assemble this combo even on a $50 budget
Red Dungeon Cards Venturing into the Dungeon Cards Kick in the Door isnt the best venture card and only really works if you have enough mana and a creature to cast it with
These colors typically want games to go as long as possible to build resources and set up win conditions
Taking this into account, I believe Arcane Maelstrom to be the best mix of all three