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The mentor ability and four power can pump a lot of your smaller creatures, and the fact that you can redirect damage is a great deterrent that's often lethal

It was reinstated by errata not long after that

There cannot be more than player who is the monarch simultaneously

It blocks like a champ and starts building you an army

Notion Thief steals much more than the thought of a good meal in Commander, where it regularly pinches peoples card draw, and sometimes combos with wheel effects to make everyone really, really hate you

Both are cheap enough to cast when you reduce their mana cost with familiars, though the wall is technically easier as it only requires 1 blue mana