Bladecoil Serpent is a Grixis creature for its triggered abilities, while Nicol Bolas, the Ravager is a gold tricolor card, and Norman Osborn has the Grixis Green Goblin as a transformation
Valiant is an ability word that appears on many Mouse creatures and highlights abilities that trigger whenever one of those creatures becomes the target of a spell or ability you control for the first time in a turn
Better still, rather than sending it to the graveyard, it exiles it, as the name suggests
The nasty ruler of Wonderland makes several appearances in Rise of the Floodborn, but none are more scary than Queen of Hearts, Capricious Monarch
Sometimes a card debuts in these sets that are clearly planted for Legacy or Vintage play which aren't that powerful for Commander, like True-Name Nemesis
There has never been a 4/3 for 2R without a drawback in Magics history