That's the main difference between Historic and Timeless: you can play any card on Arena
Just because someone wheeled doesnt mean the cards you discarded should be lost forever, or more than likely you have cards youd like to recast more than once per game
Feb 7, 2020 Sword & Shield launches (English), starting the modern era of V / VMAX-style play
Mazemind Tome saw play in Standard, and sees play in Pioneer Midrange decks, so I expect it to hang out in some Standard decks over the next few years, especially in decks like Mono-Black Midrange or Discard
The quantity can be attractive, but focus on the associated wagering, the selection of eligible titles, and any cap on convertible winnings
If the player uses another card such as Sky Field, the damage can go as high as 250, making everything become a one-shot prey following the attack