urza's saga booster box MTG: Sealed Pack from - Magic - Urza's Block English It was the first Expert MTG / Urzas Saga

The best part of this card is that its a Humility effect that only gets your opponents, and it costs 3 mana at instant speed at that

As for Mars, shes more of a catch-up mechanic

Ancient Gear Box X EARTH Level 4 [ Machine / Effect ] ATK 500 DEF 2000 If this card is added from the Deck or Graveyard to your hand, except by drawing it: You can add 1 EARTH Machine-Type monster with 500 ATK and/or DEF from your Deck to your hand, except "Ancient Gear Box"

There are many features that define Commander as a format from the social aspects to the power level discussions and the commanders themselves

The first roll of the planar die every turn is free, then it costs one more generic mana for each time it has been rolled (0, 1, 2, 3, ...)

commons, uncommons, rares, ultra rare, EX, GX, V, Vmax, etc