Heartland and the Fearsome Four of the Dark Dueling World to use the new "Numbers" to battle Yuma
Exploring the castle, Vector's body moved on its own, unlocking the path to the chamber of the "Number"
One mythic eldrazi snuck into Foundations and Edge of Eternities brings them back to the Standard rotation
The game checks through a list of these rules any time a player is about to get priority, and uses state-based actions to move cards around and otherwise ensure those rules are enforced correctly
If this card is sent from the field to the GY: You can Special Summon 1 "Eldlich" monster from your Deck, Extra Deck, or GY
while this card is in the Field Zone, that Set card cannot be activated until the End Phase, and your opponent must activate it during the End Phase or else return it to the hand