Arcane Signet, Smothering Tithe, Dockside Extortionist, Thassas Oracle and others have become ultra-staples displacing entire classes of card from the format, and community sentiment around new legendary creature designs which play too well with the mechanics and needs of Commander is similarly mixed
For example, if you put a Robobrain War Mind onto the battlefield with The Master's last ability, its base power and toughness will be 3/3, and the number of cards in your hand won't affect its power at all
Thalia's Lieutenant
In particular, the cycle of Elemental Incarnations (including Grief, Fury, Solitude, Subtlety, and Endurance) from Modern Horizons 2 have taken Modern by storm, giving a wide variety of decks access to incredibly powerful cards that can be cast for zero mana and easily recurred
If you cast the half that has aftermath, you'll exile the card if it would leave the stack