Nico Robin is crazy good with Blue Yellow Nami, letting you trigger your Leader effect while giving you additional Life cards, and if KOd she deals damage to the opponents Leader, putting them in a more vulnerable spot to your attackers
Magus of the Wheel sees play in the wheels EDH archetype where you need to discard and draw very frequently to turn on synergies, be it discard, draw, reanimator or madness
This is a unique piece of identification that separates every player's account
There's some fine cards a step below these, like Moonfolk Puzzlemaker, but I'm not moving into blue for that card right now
I rarely call anything MTG-related lazy, but this fits the bill, and has produced some of the ugliest MTG cards ever printed
For that exact purpose, the Liliana Amonkhet planeswalker deck as a whole will suit your needs perfectly