This is extremely useful when all you have are reactive cards and you need to find more proactive spells: You get to cast whatever you found useful in the 7-card batch, and regain your reactive cards at the end of the turn
2.0/10$0.72 Pyrrhic Revival Sorcery Each player returns each creature card from their graveyard to the battlefield with an additional -1/-1 counter on it
Its fun to see how far Magic has come (or where its gone) through the lens of the few cards that are really bad
Then you can discard two cards at the beginning of your first main phase to return this to your hand from your graveyard, which is card disadvantage naturally but with madness, lands, discard triggers like Archfiend of Ifnir, and loads more, it's got value
In the past, the main concern was random, expensive, old Reserved List cards, which are comparatively easy to counterfeit
This is two mana less than half the time and so has dubious eligibility for this list