Based on real Commander and Modern gameplay experience, Wrenn and Six behave like that tiny engine that looks harmless until you realize your opponent has been replaying the same fetch land for four turns straight
These two starter decks were designed as an intuitive way to learn magic
And of course, Sword of Hearth and Home
Each players deck, discard pile, hand of cards and inkwell do not count as in play and therefore cant be affected by abilities unless the cards text specifically says so
Boros has access to a ton of support for Equipment, with cards such as Freya Crescent acting as a mana dork, Adelbery Steiner getting a stat boost from all Equipment, and Firion, Wild Rose Warrior giving equipped creatures haste as well as a copy of any Equipment entering
Playing a card stores its seal in your "arcana gauge." In the example below, the astrologian draws The Ewer, which has the moon seal, then plays it, storing a moon seal in their arcana gauge