Silver-Fur Master grants so many options on its own, and it can turn an already-good ninjutsu deck into a near-unbeatable ninjutsu deck (so long as the draws are good, of course)
Ultima was a spell we knew we had to make
The biggest issues comes from tokens: Lae'zel's Acrobatics only protects real creatures and cant save the board in token decks
Rashmi and Ragavan is way more exciting than the face Commander of the Temur Precon
Jodah, the Unifier players are already salivating, as are Counters players who have noted that the counters never move off Aerith when she dies, so they can be moved onto the Ozolith
(2020-06-23) Once the first triggered ability is on the stack, it won't trigger again, even if more damage is prevented and more incarnation counters are put onto it