This is another one that makes perfect sense to me, and I dont have any meaningful argument against, save that it is so expensive that those who cast it have earned it, no matter the power level
Thrill of Possibility for instance, features a particularly cute Karlach, and that's driven a 10 cent card to $4, but not all the instants and sorceries in those drops fare so well
With white copying, you can have cards with a hypothetically powerful effect like giving you two or more copies of a good, efficient card advantage creature
Fast forward several years to Commander 2019 , and suddenly we have a creature that can not only let you abuse this mechanic all the time, but is also available in your Command Zone if you so choose for 4 mana and 6 life
There is almost always a good use for Ajani Vengeant