We don't have a lot of White removal for 'walkers, so this is pretty important and I suspect it'll make an impact
Vivi Ornitier made a massive splash in multiple formats upon release, but it might be best-suited to Commander, where you have the time to really exploit the pinging and absolutely insane mana production for a 3-mana commander that isnt green
Jadzi has become one of the win conditions in the self-mill version of this deck since it can churn through your entire library with ease
This probably comes down reasonably large in a green ramp-heavy meta, but theres got to be better things to do with four mana
We ramped up into Commander decks, starting with Warhammer 40,000 Commander decks, and eventually into full sets, the first of which was The Lord of the Rings: Tales of Middle-earth
After lessons are cast they behave as regular instants or sorceries, so they go to the graveyard when they resolve