Stitch in Time goes from "garbage" to "kinda neat"
Isshin ensures each trigger fires twice creating double the tokens, dealing double the damage, drawing double the cards
Outside of these environments, Urza can still be quite good, as he generates 2 bodies for 4 mana, provides a mana sink with a powerful payoff when needed, and can even turn things like Equipment and Sapphire Medallions into tools to race ahead of your opponents while still employing their inherent value
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Bad Mechanic Hosers (Nine-Ringed Bo, Tombfire, Root Cage, Trapfinder's Trick, etc) There are a number of mechanics Wizards of the Coast were clearly worried about when they printed them
Or, if you want to go a more unexpected direction, Azusa can be a surprisingly effective control commander in green