Aurelia is probably the best Commander to take advantage of extra combats
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Clear Wing Synchro Dragon X WIND Level 7 [ Dragon / SynchroEffect ] ATK 2500 DEF 2000 1 Tuner + 1+ non-Tuner monsters Once per turn, when another Level 5 or higher monster activates its effect on the field (Quick Effect): You can negate the activation, and if you do, destroy it
It's best in multi-colored decks as it will discount the spell by two mana, assuming the spell has the two colors you named in its casting cost
Super Quantal Mech King Great Magnus If the creators took the time to give this card a long name, that would mean that it should be overpowered
The Casual vs Competitive Problem When considering high-end Commander, whether competitive in nature, or in name (like cEDH), I think this argument is most watertight