Beast Within also has the flexibility of hitting any permanent, and while I definitely understand not wanting to give green an instant speed board wipe for all permanents, I feel like this card would have seen more play if it also hit nonbasic lands
Terra, Cloud, and Tidus are the clear picks for their games, but how did you land on Yshtola for Final Fantasy 14
While this isn't an official list and inventory will vary, these stores may be a good place to start your search
They have sweepers, but you can fight through those
That gameplan is the one I most associate with Narset as a character: attempting to chain together extra turns in an extended spell combo until we can win by beating down
For example, I know how to play Pokmon Trading Card Game (with the older cards, at least I am at least two decades behind these days) and have beaten its Game Boy Color adaptation multiple times