Just for this set, the Prerelease Packs have separate Urza- and Mishra-themed packaging, so you can choose which brother to fight for
The entire theme revolves around celebrating the 25 anniversary of the game
3 Grinning Grave Virus The wonderfully-named Grinning Grave Virus is one of the easier Virus cards to use, requiring only a dark monster with 3,000 or less attack points to meet its demise
I would be surprised if we trend anywhere in the downward direction the rest of the year

Power-up Card: Invigoration, Spring of Rebirth, Crush Card, Paralyzing Potion 643 - Morphing Jar Type: Rock Attribute: Earth Attack: 700 Defense: 600 Summoning Level: 2 Power-up Card: Invigoration, Spring of Rebirth, Crush Card, Paralyzing Potion 644 - The Thing That Hides in the Mud Type: Rock Attribute: Earth Attack: 1200 Defense: 1300 Summoning Level: 4 Power-up Card: Invigoration, Spring of Rebirth, Paralyzing Potion 645 - Stone Ogre Grotto Type: Rock Attribute: Earth Attack: 1600 Defense: 1500 Summoning Level: 5 Power-up Card: Invigoration, Spring of Rebirth, Paralyzing Potion 646 - Stone Statue of the Aztecs Type: Rock Attribute: Earth Attack: 300 Defense: 2000 Summoning Level: 4 Power-up Card: Invigoration, Spring of Rebirth, Crush Card, Paralyzing Potion 647 - Dark Plant Type: Plant Attribute: Dark Attack: 300 Defense: 400 Summoning Level: 1 Special Info: (Destruction) When this card is destroyed in battle, all adjacent spaces are transformed into CRUSH terrain