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Elves have been around since the very first MTG set back in 1993, with Llanowar Elves appearing in Alpha alongside such lesser-known cards as MTG Black Lotus
There are great elves and faeries that like to come down in droves so it's not too hard to keep a few relevant creatures on board
This card doesn't start in your deck but in a special "Command Zone." You can cast your commander from this zone, and if it would die or be exiled, you can return it to the command zone to be cast again, though it costs an additional two mana for each subsequent cast
Atraxa, Grand Unifier has usurped Griselbrand as the reanimation creature of choice in many decks and formats
I think even if they cant explain why, part of the reason some players have that gut reaction is that spells like Ruination or Armageddon are used as griefer spells instead of win-conditions, bringing the game to a halt with no plan to victory already in play