Cards like Mycosynth Lattice or Trinisphere push Karn from irritating to game-ending, and the fact that this happens without attacking explains why he ranks among good planeswalkers, arguably one of the best to ever get printed for artifact-heavy metas
Or the Aristocrats deck with [card]Boros Reckoner[/card], [card]Blood Artist[/card], and [card]Blasphemous Act[/card] a combo deck
She's got every citizen in her back pocket, and they don't even know her name
Agent's Toolkit is such a sweet card, entering with an assortment of keyword counters and handing them out as you please
: Each opponent gets an emblem with "At the beginning of your upkeep, this emblem deals 1 damage to you." : Chandra, Awakened Inferno deals 3 damage to each non-Elemental creature
Sets like Commander Legends: Battle for Baldur's Gate, Dominaria Remastered, and The Brothers' War use this format