For example, if the exiled card is a land card, they may play it only during their main phase while the stack is empty and only if they have an available land play remaining
Vintage Lurrus of the Dream-Den unbanned Lurrus was originally banned before the companion errata due to its absurd strength in the format, being the only card banned on power level and not even being able to be hampered by a restriction
This card would work wonderfully in just about any Magic format
There's no way you get a better creature for only 4 mana in the Oldschool format, which is also why it's heavily wanted
Liliana Vess allows the player to force their opponent to discard cards, allows them to search their library for a specific card, and can return all creatures in both player's graveyards to the battlefield under their control, flooding the board with creatures for a huge swing, which will often lead to the end of the game
Im a hyper-competitive jerk and need something that reins in my need to know what is best in life