Larger playing card sizes can be great when creating educational flash cards or novelty cards
Creatures that come under your control later in the turn won't be copies of the chosen creature
Then, anytime a creature you control exploits a non-Human creature, you get to draw a card from Henry Wu
(The expected value of your low roll is the dice size minus the high roll EV plus 1, so 1.875 in the case of two d4s.) For the d8s used on Arcane Endeavor, the expected value of your high roll is 5.8125, which means that if you prioritize drawing cards, youll be drawing about six cards on average, and getting to cast a spell of about mana value 3
But Wizards of the Coast have learned their lesson, and they don't dare printing another overpowered Teferi planeswalker like it was the case in the past few years
(Collector viewpoint) From a collector point of view, the answer is: yes, they can be very worth it, as long as you understand what you are buying