It was just reprinted in the new core set and both are Standard legal, weirdly
In long games, I could see this even getting to 20 rev counters
For decks interested in forcing their opponents to draw, this card is a less detrimental Howling Mine as it doesnt generate pure card advantage and plays well with cards like Sheoldred, the Apocalypse and Narset, Parter of Veils
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Because Sprout Swarm has both the convoke and buyback mechanics, it becomes a self-sustaining infinite loop as long as you have four creatures on the battlefield
The contents and probabilities for cards in play boosters vary somewhat