While other cards like The Last Ronin are easy mentions, that card will likely see heavy use in Enchantment/Saga-based decks and not be overlooked due to its Mythic status
Honestly, I am slightly surprised that it has been given such a steep mana cost for its small stats, that makes me think that Blue-White might have been slightly too strong in Wizards' internal testing, so I am excited to try out this archetype
Adventure is an instant or sorcery you can cast before you get to the main card
Beyond Devoted Druid shenanigans things become a bit murky because some decks that could use Tyvar will still want Grist instead, but Tyvar does offer some interesting possibilities in other decks
Today, Jeskai Black only makes up 17% of the meta and Jace, Vryn's Prodigy shows up in about 35% of decks
It is hard to respond to an action that doesnt use the stack