6 booster packs, including 2 Sun & Moon Base Set, 2 Guardians Rising, 2 Burning Shadows
Play creatures with your (usually) doubled mana, and then draw cards to keep playing more creatures to keep drawing more cards
Marcy: I think the only negative to this is the requirement of a creature to make it free, but there are quite a lot of easy to include Blue creatures even in mono to make this worth it
Collection: (2021) Structure Deck: Egyptian God Obelisk the Tormentor (EGO1) Yugioh
Included in this drop: 1x Foil Sorin Markov Brooding and majestic in his animal form
Mana Vault Fallout: Vault Boy $1,737.76 The most valuable Secret Lair artifact card ever also weighs in as the most valuable Secret Lair bonus card due to only being available in a single Secret Lair Drop and being a reprint of one of the strongest mana rocks ever