Force of Virtue is probably the most powerful of the bunch since we can usually cast it for free by pitching a random white card
Several cards with the mechanic were quite strong in Constructed play, and while its mostly thematically tied to the Rakdos guild on Ravnica, it could appear again pretty much anywhere
Multicolored Warrior of Light (Jodah, the Unifier) Rating: 1/10 This set has a far higher-than-average number of legendary creatures, so if you can actually land Jodah, the Unifier, it should be game-breakingly powerful
If not, some way of swapping them between your hand would make sense with Merlin Shapeshifters ability
This setup lets you exile and replay cards infinitely and mill yourself until you can either storm out the table with Brain Freeze itself or pivot into a Thassa's Oracle win
Played as a standalone card, its not very good but the ability to represent a lot of threats without additional mana investment makes me think that this has a very high ceiling