Greninja acts as support, providing additional damage with its Ability
Lore :You can only activate this card when your opponent declares an attack
There are many ways this could be looped, and it just does it's thing, cycling through your deck
In the simplest case, you'll only have basic lands (Plains, Island, Swamp, Mountain, and Forest) to work with
These are the cards you need for the 'Mega Shine: Immersive Experience' Secret Mission: Mew #85 (Immersive Rare/ Three Gold Star) Mew #86 (Immersive Rare/ Three Gold Star/ Shiny) Rewards: 36 Wonder Hourglasses, 12 Pack Hourglasses and 10 Shop Tickets
How it wins Stack a doubler (Hardened Scales, Branching Evolution, Doubling Season) with a counter distributor and watch every trigger pay double