Being able to pay three mana to cast anything from the graveyard for a turn essentially translates to drawing a huge number of cards at a very low cost, but without the randomness that comes with actually drawing the cards
Farewell is strongest when all modes are used, but the caster can pick just one or two if they choose, making it a bit overcosted for its effect but more flexible
To protect your card collection with sleeves is extremely important and ensures that your cards stay in great condition
Give them some type of evasion and there's a good chance you can start kicking players out of the game with just one attack
While in and of himself he would be a great card to have in limited, one of the block mechanics were "recurring" enchantments such as Rancor and Launch
The bar here is higher, I'll admit, but I want to acknowledge that these cards can be interesting