Outside of +1/+1 counters, I can see an infect or toxic deck or a very low to the ground Saga deck is going to gain a lot of value out of this
Having only a couple cards with keywords like first strike and flying and this card on the field can turn your attack into an impossible-to-block onslaught
While Mono-Black decks have access to a lot of top-tier graveyard hate, including the inimitable Dauthi Voidwalker, Mono-Blue decks, or blue decks without black in their identity, arent quite so lucky
Here is everything you need to know about them, including what formats you're allowed to play with them in
Standard is way too fast for this, and Commander has plenty of better options
These are the most exciting applications for Stone by Sunlight, but its real strength lies in its flexibility