Deviate from it if you feel like your deck needs fewer or more lands, for example
Life gain against aggressive strategies, card advantage against decks wanting to grind, mana to give you a needed explosive turn to catch up these are just some of the most useful functions it serves in different spots
Narrow Abilities: While we do get a solid mix of activated abilities, they are a bit narrow in focus
Extus, Oriq Overlord / Awaken the Blood Avatar Extus, Oriq Overlord is an interesting sacrifice-based legend, allowing you to sacrifice creatures and return them to your hand with magecraft triggers
Its not worth trying to sell $1 cards and the like here, so save those for larger lots or retailers interested in buying chunks of cards at a time
Huntsmaster of the Fells is a card jam packed full of power but it is rather phaffy and doesn't fit all that well into many decks