Sadly, Pixie Guide is blue, so a Commander deck helmed by Mr
If Grist, Voracious Larva leaves the battlefield while its triggered ability is on the stack, you can't exile it from the zone it's put into, so you won't return it to the battlefield transformed under its owner's control
Damage that is prevented never occurs, so any triggered abilities that trigger due to combat damage that would have been dealt by Weeping Angel won't trigger
Here are some tactical combinations involving token generators: Token Overrun: Use token generators like "Gather the Townsfolk" to create a swarm of creatures, then unleash cards like "Overrun" to give all your creatures a massive power boost and trample, overwhelming your opponent
Likely best in Golgari, oddly, just because of the overlap of unleash, evolve, and scavenge
Wizards themselves havent managed to do that, the two printed two-mana planeswalkers being on opposite ends of that scale, Wrenn and Six being ban-worthy in legacy and Tibalt being a joke to this day, even a constructed-playable card later