For more, check out Planeswalkers Guide to Strixhaven
Void Beckoner Like we mentioned above, ability counters are something to shout home about, but turning large creatures into value-level combat tricks through the addition of ability counter piles makes cards like Void Beckoner, an otherwise large-yet-unplayable creature, into an absolute MVP
And finally, having a lot of good synergy with your decks theme
Marrow-Gnawer's effect is the main way you'll be building up a board presence quickly, so ways to re-use it multiple times a turn are key
I saw that it's now around 4 dollars for the card and almost twenty for the foil
The actual effect changes based on the card its on - so you might be able to just draw a card, or you might be able to put a dragon into play from your hand thats tapped and attacking