The Spellbook deck was all about using spell cards
Wall of Blood and Deepwood Ghoul are cheap creatures that let you pay tons of life
Recommended cards: Toadally Awesome (extra deck), Number 96: Dark Mist (extra deck), Ronintoadin, Swap Frog, Poison Draw Frog Phantom Knight Phantom Knights are a solid choice for limited tournaments with the best graveyard engine of any of the top XYZ decks
Xyris is very much an Optimized (Bracket 4) deck, and it competes happily at that level of play
If multiple players have Auras to put onto the battlefield, the player whose turn it is announces what their Auras will enchant, then each other player in turn order does the same, then all enchantments (both Auras and non-Auras) enter at the same time
Although strong, protection cards are reliant on the opponents deck having their specific quality