As always, the control gameplan has a few phases
Yzmas Feel the Power ability essentially guarantees that Amethyst decks wont ever be without cards in their hand
The creepy, slow-moving lizard that can kill you with a single stab just wreaks havoc on you in every game it appears in
The Black Mage essentially gets a tweaked version of a core Vivi ability: he deals one damage to each opponent whenever you cast a noncreature spell, or three damage with a full party
A Svella deck thats focused on snow is going to be stacked full of mana dorks and big-mana creatures, and some big-mana enablers like Fanatic of Rhonas or Nyxbloom Ancient
While a card with an Adventure is in your hand, library, or even exile, it has only the characteristics of the permanent, not the Adventure spell