A stuck and defended Norn will end the game against Affinity, Merfolk, and Infect, not to mention causing serious problems for Twin and Abzan/Abzan Liege
There's no window between when a token enters the graveyard and when it leaves the game where you could reanimate one
Lutri, the Spellchaser Its hard to have a card banned in Commander at the top of this list, so Lutri, the Spellchaser chills at number two
Best card-draw cards MTG Treasure Cruise Skullclamp Brainstorm Sylvan Library Faithless Looting Phyrexian Arena Beast Whisperer Rhystic Study Esper Sentinel Sphinxs Revelation There are a lot of ways to draw cards in MTG
If you happen to be in a tournament setting, you could call a judge, but hey Unhinged is a fun, casual set