This is because of their incredible firework design, where as you tilt the card into the light, the holofoil makes it looks as though fireworks are going off
According to the manual, Power is achieved by strong monsters bringing a "quick and decisive victory," and Technique is "withstood an opponent's attacks to the limits of your Life Points by effectively using Defense and Trap/Magic Cards." If these conditions sound vague, it's because they are, and unless you're okay with more trial-and-error, you'll need to look that up too
Where Can You Find Examples of Roll Up Your Sleeves
Ping your opponent with a flying infect creature like Viral Drake to get the ball rolling on poison counters so you can then attack with Chained Throatseeker for more infect damage
Whether its a pack filled with foil Planeswalkers or some full, borderless art staple cards, Collector Boosters are worth every penny