This includes when you attack, during your upkeep before you draw for the turn, and even on your opponents turn
Do you hate it
I've used derivatives of this quote with friends and co-workers who are unfamiliar with Magic and it always earns a chuckle
Warp World takes the current game state and turns it into an absolute crap shoot as everything is shuffled back into players' libraries and new permanents are returned to the battlefield
The classic examples are the Onslaught cycle, which gave us Flooded Strand, Polluted Delta, Windswept Heath, Wooded Foothills, and Bloodstained Mire, and the Zendikar cycle, which added Scalding Tarn, Misty Rainforest, Verdant Catacombs, Arid Mesa, and Marsh Flats
Because its not specifically called out in WotCs terms and agreement, third parties arent technically prevented from selling Arena codes for special products, decks, or individual cards