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Black didnt have a cheap and reliable removal spell like Lightning Bolt or Path to Exile before this was printed, and Push revolutionzed black removal when it was printed

That made good answers hard to come by while the Sliver deck was functioning as intended, as winning combats was hard, winning them quickly without trample was even harder, and removal was temporary

Dueling Grounds Dueling Grounds doesnt belong in every Selesnya deck since its an active impairment to its many go-wide strategies, but anything that plays a bogles-esque strategy that builds the biggest creature in play can use it to prevent multiple blockers from getting them down

Much like Athreos, Heliod is great as a commander or as an inclusion in your deck