To determine how many additional +1/+1 counters a creature enters the battlefield with, use Arwen, Weaver of Hope's toughness as that creature is entering the battlefield
While there are plenty of substitutes that deal with artifacts and enchantments like Ancient Grudge, Wear // Tear, Nature's Claim, Vandalblast, and Kataki, War's Wage, none of these cards really do what Stony Silence does
That's a great recipe for getting more creatures in play and protecting them at the same time
Then again, it stops Snow and other stuff from triggering (well, Snow does banish, but this card blocks her effect from triggering in the GY)
The game's got a lot going on
No changes can be made to either Deck for an event using the Sealed format