playtest mtg cards Mystery Booster pre-review: Blue Don't Worry About It -

That said, this seems unlikely, and if it does happen, I imagine it will be more the fault of Emrakul than anything else

Instead of spells resolving in complete batches, players could now interact on the stack at any point, interrupts were removed from the game, combat damage used the stack, and the rules deactivating tapped artifacts and preventing tapped blockers from dealing damage were removed

He becomes an above-rate creature as soon as you have more than three lands out, which is easily done thanks to the first ability

In decks dedicated to sacrificing artifacts (Cat Oven Combo?), its going to be a scary threat