Build up a strong enough board presence, or get your opponent low enough with chip damage, and you can create a game state where your opponent can't even kill your creatures without risking death themselves
The set itself contains a whopping 1,670 reprints from across the game's history (see below for the full list), plus 121 copies of something new and surprisingR&D Playtest cards you won't find anywhere outside of Mystery Booster: Convention Edition
According to Wizards' Wednesday announcement, there are ten different booster themes
If heads, prevent all effects of an attack, including damage, done to Aphmau during your opponent's next turn
this card gains ATK equal to the total original ATK of all other monsters on the field, then, if this card has a DARK Xyz Monster as material, negate the effects of all other face-up monsters on the field
Stick this and youll start freerolling battlecruisers into play every upkeep