I Think the less useful creatures are either metamorph and noxious,
from both i think the noxious is the worst because you will have matches that does not require removal
Would cut 2 noxious gearhulk
I think you would need to go for a total overhaul to go for modern, startig by defining if you want to keep 4 colors or focus on bolas's color (grixis)
Then after defining this I guess we could work on those lands and then go up to the spells.
https://www.mtgsalvation.com/decks/6112-ninja-tribal
https://www.youtube.com/watch?v=ZuehSH_es3E&list=PLayNvUwOHp1BhKuxs-E7AXBiuIxKR_Izj
what do you think about cards like:
Kismet, Frozen aether and Ghostly prison like effects for protection?
You can try Dragonlord Dromoka, conqueror's flail, silence, Iona, shield of emeria,
Grand Abolisher, Autumn's Veil, Vexing shusher and so on..
There aren't a lot of cats and fishes with reach..
Maybe even legendaries?
from both i think the noxious is the worst because you will have matches that does not require removal
Would cut 2 noxious gearhulk
Then after defining this I guess we could work on those lands and then go up to the spells.