You can stuff your deck with every fetchland imaginable to get two cards and two life for each land you play: Misty Rainforest, Terramorphic Expanse, Prismatic Vista, Bant Panorama, even the new auto-sacrifice ones from Streets of New Capenna like Brokers Hideout
If some of the creatures are illegal targets as the chapter II ability tries to resolve, the original distribution of counters still applies and the counters that would have been put on the illegal targets are lost
The Power Nine are a relic of a brief time when card design was unfettered by concerns of balance against other sets, and their abilities are truly exceptional as a result
Not yet broken in any other format, but threatening to be broken none-the-less
Miles Morales can help set up future turns by putting two +1/+1 counters on each of up to two creatures, which gives you a solid foundation to work on when he flips and doubles each counter on legendary and/or Spider creatures every time Ultimate Spider-Man attacks
It was also overwhelmingly negatively received by players, who strongly dislike the acorn stamp change, and the fact that mechanics like stickers were legal in most formats