That does some wild stufffor example, it gets Marsh Flats back twice for actual land ramp in Orzhov, it lets you feed cards like Dusk Legion Zealot into a Warren Soultrader multiple times, or it wrings the most value possible from cards like Boromir, Warden of the Tower and Dauthi Voidwalker
If the target creature card is an illegal target as Golbez, Crystal Collector's last ability tries to resolve, it won't resolve and none of its effects will happen
As for the best of the new creatures, O'aka, Traveling Merchant turns your excess counters into carddraw, and Maester Seymour grows creatures of your choice as you grow him
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With the right setup, Lightning can blow through an enemys defenses and force them to scramble for a way to stop her