It's a great fit for grindy white decks that need to stabilize without locking themselves into permanent exile, and returns already lost threats to your hand once it leaves
The strategy is to keep Suicune EX in the Active Spot to draw cards and set up two Greninja on the Bench as quickly as possible
What the Variance Looks Like Most boxes return 2,000-4,000 in card value from the guaranteed SR + AR + RR slots
Pikachu ex doesnt have a ton of HP, only sitting at 120, but with a retreat cost of just one Colorless Energy you can back them out if it gets a bit too dicey
It also puts interesting restrictions when choosing a commander for your EDH deck
One of the great things about taking an extra turn is that you get another activation from all of your planeswalkers, which gets them one step closer to ultimating and winning the game