Besides Pikachu, Greninja is Ashs main partner in the X&Y anime, and it only recently got an official Mega form apart from the unique Ashs Greninja. In the original anime, Greninja would only Mega Evolve via its special bond with Ash
There are various ways to grab impactful cards, or cards with interesting enter the battlefield effects
The card also does a great job showing off some of Raritys passion for fashion as shes in the middle of designing a scarf
Since it scales with your opponents energy as well, it punishes players for trying to set up their own big attackers
Combine that with the fact that it's not three colors and eight mana, and I think I'm a bit offended on WatchdogWatchdog's behalf
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