Many players consider Show and Tell among the most overpowered MTG cards for unfair strategies because it completely ignores mana costs
Well, six, if you include the artwork for Brisela, Voice of Nightmares , the combined Eldrazi Angel form of the two Angel Horrors Bruna, the Fading Light and Gisela, the Broken Blade
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Shield counters don't prevent players from sacrificing creatures
Endlessly versatile and useful, Artifacts are among MTGs most loved card types, and the Sixth Doctor copying them for free and ignoring the Legend Rule opens up a number of new Artifact strategies
Migloz, Maze Crusher Migloz, Maze Crusher is a nicely versatile card in Limited or Constructed, and it also wouldnt be terrible in the 99 of a commander deck
Cosmic Eclipse