Obviously, this is brutally strong and Teferi, Time Raveler is banned in multiple formats as a result
However, Magic players have never really had a good incentive to build a deck with more than 60 cards outside of Battle of Wits
Red/Purple Trafalgar Law has dominated the meta, and its all thanks to this amazing Eustass Kid blocker card
It's main use is to be super fun with things like Well of Lost Dreams ("Instead of drawing this card, I'll gain life and also draw cards!") Sadly, you don't have blue in your color identity, so you can't play Drogskol Reaver, but for redundant copies of that effect, you do get Dawn of Hope once Guilds of Ravnica releases and even Lich's Mastery if you're crazy enough
Of course, you don't care about that downside if you're playing cards from your graveyard, and that's exactly the kind of playstyle this card enables