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I've played elves in Modern before: U/G C-c-c-combo Elves
If you want to play black, you're going to need at least a couple of copies of Sheoldred for the sideboard
Cards like Moltres ex bring legitimate firepower and intricate synergy to Rocket-themed builds that could shake up the meta significantly
Proliferate cards such as Atraxa, Praetors Voice can still give you more counters if you already have at least one, so you could become a victim of infect if you accrue 10 poison counters while under the effects of Teferis Protection
While there are counterplays to Venusaur ex, such as one-shotting it with cards Charizard ex Tera, forcing a retreat or getting lucky with the coin flip, Venusaur ex generally does not have to worry too much about being able to stay on the field