As it has more opportunities to be able to trigger
Urzas Saga At this point, it may seem like Urzas Saga can do basically everything and that isnt entirely false
If it gains menace, Bristling Boar can't be blocked
The deck's commander, Firmuth, Sage of Corrosiveness, is a perfect example of this strategy, as he gets stronger as you mutate creatures under your control
But no more
Elspeth, Knight-Errant With its ultimate ability, Elspeth, Knight-Errant offers one of the most permanent forms of indestructibility you can get: an emblem that makes all your artifacts, creatures, enchantments, and lands indestructible