The Ancient Guardians booster set introduces a trio of brand-new strategies, and Duelists will find lots of useful returning cards to help them build Decks around the new themes
Essentially you play games, get a ranking, and then play against similarly ranked players
For some like the planeswalkers it is for technical reasons, while both can offer a great influx of cards immediately they are dependant on the board state
This gives us a way to pseudo-protect our most important creatures, reuse our enters triggers, and also offer a soft protection lock with something like Hakoda, Selfless Commander, which we can sacrifice to give our team indestructible and then exile to Boiling Rock Rioter to recast and repeat the process
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(1) If this card is Normal or Special Summoned: You can send 1 card that mentions Atlantis, the Dragon City from your Deck to the GY, except Fiendish Vortex of Atlantis