Any reason to run a stealthy Ninja is probably good, especially in Ninja and ninjutsu-themed decks
Yes, creatures are (briefly) spells too in fact, the only cards which are never spells are Lands, since those are played straight from hand to battlefield without touching the stack
(2023-06-16) Abilities that trigger "whenever players finish voting" trigger once all players have voted or once all secret votes are revealed, but they won't go on the stack until the current spell or ability finishes resolving
The set introduces 18 new cards including support for archetypes like Big Mom Pirates, Navy, Thriller Bark Pirates, and Straw Hat Crew, while reprints with alternate arts offer new versions of fundamental cards like the 4-cost Luffy that slows down opponents, the 4-cost Koby that dominates the field, and the 6-cost Sabo that accelerates aggressive strategies
It is a brutal card to face as a combo or a control player and it is rarely a bad draw against agro decks