But the real anti-casting cards in Gruul have to be the artifact and land destruction
If a spell with rebound that you cast from your hand doesn't resolve for any reason, including being countered, that spell won't resolve and none of its effects will happen, including rebound
Creatures (15) Planeswalkers (5) Lands (22) Spells (18) Another problem on top of that, as we can see in the above decklist, is that so many slots are spoken for because you need ways to actually make energy to fuel the Marvel with
Sven Stolz Another card which I was surprised seeing in the top 5, Relic of Progenitus has been the go-to graveyard hate when it came to Modern for a long time
While it's tempting to add high mana creatures to the deck, you have to remember that since the draw is random, you may not be able to cast any creatures until late in the game (or at all, depending on your opponent's deck!)
With five cards that meant I needed something that had five parts to it