Three spells have the specific clause of "This spell can't be copied"
The game has evolved over the years
For the same eight mana you would play for Craterhoof Behemoth, you get a 7/7 that gives each of your creatures +2/+2, vigilance, and trample until end of turn
Players have also been introduced to the new dual ink, vanish, and boost mechanics, alongside two new rarities, Epic and Iconic
According to The Commander Format Panel, "Game Changers dramatically warp Commander games, allowing players to run away with resources, shift games in ways that many players dislike, block people from play, efficiently search for their strongest cards, or have Commanders that tend to take away from more casual games." The Game Changers List dictates some elements of how strong a deck is, by giving guidance on how many should be played or which ones should be talked about
1 Archetype of Imagination