Gandalf the White provides even more value for legends and artifacts with it second ability
Its Monstrosity ability, for 12 whole mana, turns it into a 20/20, which would be a total of 19 mana for a 20/20 creature that clears its own path through on the way to your opponent's face
Just to reiterate, this isnt a list of every archetype in Commander, but it encompasses the majority of the most widely-played strategies, with overlap between them, and plenty that split off into their own subsets of micro-archetypes
Each of these cards costs a single mana, the inevitable one, and each of them gets you information from the top of your library in addition to drawing you a card
Arc Trail is very easy to get a two for one with and can even find it happening against non agro decks
Does Loss of Life Count as Non-Combat Damage