If its about to go to be destroyed, you can respond and pay to regenerate it rather than paying the commander tax after returning it to the command zone
Players also choose a legendary creature or Planeswalker to be their "Commander" or "General" (a Planeswalker must be designated as allowed to be used as a Commander), which begins the game in the "Command Zone", from where it can cast directly to the battlefield
Finally getting into new cards Bloodthirster is insane
More recently, there was also Vexilus PraetorVexilus Praetor to protect your commander or let them alpha strike through, and The Stasis CoffinThe Stasis Coffin to hold your temporary immortality over the whole table
Edge of Eternitiesfeatures two different Commander Deck versions
Typically, cards can either give you tempo (generate a presence on the board) or give you value (keep your hand full of cards to play later)