Sounds like you have an amazingly talented team at Ravensburger
Small setbacks compound into a big problem for opponents as each point of life lost and each creature sacrificed makes your creatures bigger and piles on the damage
Underperforming Cards Yes, Krosan Colossus and Krosan Cloudscraper are huge and can turn Showstopping Surprise into a fourth board sweeper, but these cards just don't provide much beyond a big body that costs a lot of mana to produce (either through morphing them or straight-up casting them)
For expensive trainers, promos, Charizard, Pikachu, Eeveelutions, and SAR cards, PSA 10 can reduce condition uncertainty, but you still need to verify exact card identity and current availability
If you find a way to damage your opponent, either through combat damage or with a damage spell (such as [c]Lightning Bolt[/c]), you can play this spell for only one red mana, which is quite the bargain