pokemon gx japanese booster box High Class Pack: Tag All Stars [SM12a] – Card Journeys secret cards do not have a rarity symbol. Pokemon Mega Symphonia Japanese Booster

Sorcery speed kills this one a bit, but good card selection plus filling your graveyard is a lot at 2 mana

Regirock has the following attacks: Boulder Crush - 100 damage

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2: Create a 2/2 colorless Drone artifact creature token with deathtouch and "When this creature leaves the battlefield, each opponent loses 2 life and you gain 2 life." If you return a creature to its owner's hand with Kaito's first ability, you may activate a single loyalty ability of Kaito twice, or you may activate two different loyalty abilities

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This just doesnt look worth it at all, so avoid at all costs