How many sources of card advantage are good for your deck really differs on a case-by-case basis
You can play every format available in paper, buy, sell, and trade cards with other players, and it's the best way to grind out games to practice or learn different strategies
Sacrificing another artifact exiles cards from the top of your library equal to its mana value plus one, and you can play them that turn
Paladin Class will do a lot of work in tokens/go-wide decks that have strong evasive commanders or top end, and those are likely the same decks thatll want to run Guardian of Faith
A very large portion of misprints might actually be make readies
Doubling your mana puts you leaps and bounds ahead of your opponents, especially considering that this excellent green planeswalker protects itself and pressures your opponent by animating lands