Like the first modal cards, You Come to a River and Plundering Barbarian, as well as most of the other modal cards in this set, only give you two options (note that this article was written before previews were completed)
Crowd-Control Warden is a common that encapsulates both of them at once
II, III Create a token that's a copy of a card exiled with this Saga, except it isn't legendary and is a Mutant in addition to its other types
There are a ton of different land strategies, but I hope this look at land recursion helps you in your builds
To differentiate cards by set there are a few methods: First, theres the card border
I avoided attack triggers because ninjutsu has them already attacking and we'd need to wait until next turn to get their attack trigger