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In addition to taxing each of your opponents' spells by one mana, slowing them down significantly, Grand Arbiter Augustin IV provides you with a significant mana discount on your blue and white spells, respectively, providing an even greater cost reduction to Azorius spells

Gravemother is likely the more powerful option if youre playing straight out of the box, but Rukarumel easily goes on to be the more popular legend in Commander as a whole, since it can serve as the commander for any deck built around a specific creature type

Exalted Sunborn is a great variant on this effect, attached to a creature that could be cast temporarily for two mana

Zell saved his spiciest ability till last

Undefeated, she's good enough that people have started to talk

As long as GY is well-rounded, it won't lose in battle, and since it's resistant to effects, it can't be removed with other removal cards