If Primeval Spawn would enter the battlefield and it wasnt cast or no mana was spent to cast it, exile it instead makes it so you cant Reanimate, Sneak Attack or Polymorph it into existence and this design choice feels very deliberate
Modern Horizons 3 is kind of a half-step between the ideal and the standard
In a deck that can go wide on the board, as Knights certainly can, this ability is incredibly dangerous, and can easily finish an opponent off in conjunction with other board-buff effects such as History of Benalia
Whenever a creature you control with myriad attacks, for each opponent other than the defending player, you may create a token that is a copy of that creature to attack that opponent or a planeswalker that opponent controls
Summons needed to feel important, powerful, and like they could turn the tides of battle before vanishingjust like in the games
This is perfect if a strong character is heavily damaged, has a benefit to being banished, or you are simply low on cards