Vraska, Betrayals Sting Proliferate as a loyalty ability is already an engine in and of itself, and Vraska, Betrayal's Sting offers much more than that
For starters, some of the MUL cards in Collector Boosters have the halo foil, which debuted in MOM
There's no question that ETB abilities are some of the most powerful and undercosted things in the game, so having more ways to effectively answer cards like Dockside Extortionist and Thassa's Oracle feels like a net positive
If you didnt put in any 3-ink cards, what happens on your third turn
Wight of the Reliquary Knight of the Reliquarys morbid counterpart sacrifices creatures instead of sacrificing lands, which is honestly way better with all the same potential upsides
The secondary ability to exile undead creatures reflects how revival items in the games often damage undead enemies instead of healing them