pricecharting evolving skies booster box vs Eevee Heroes these packs feature a variety of alternate Elite Trainer Box & Tin:

You can summon a Rank 8 in this deck with Constructs and BLS, but in most cases youre stealing and opponents level 8 monster, such as their BLS, and E-HERO Fusion, or a Qliphort Stealth/Shell using Enemy Controller or Snatch Steal

Imagine Timetwister alongside Black Lotus for instance, or in a deck with numerous Time Walks

Either way, Belakor will make Grixis even nastier than it already is (and thats saying something)

The shocklands will be gone, after all, and aggro decks will want these instead of the much slower scrylands

Theres also a large token sub-theme: Grist, the Hunger TideGrist, the Hunger Tide Giant AdephageGiant Adephage Formless GenesisFormless Genesis We got some really fun new cards in this deck, especially Shriekwood DevourerShriekwood Devourer and the backup commander Rendmaw, Creaking NestRendmaw, Creaking Nest