pokemon booster box steam siege XY: The Mythical Steam Pokemon Volcanion must wield the dual powers of fire and water to stop them. XY Steam Siege Booster Box

The restriction is the only real drawback, but at 2 mana, copying a huge threat with flying feels closer to cheating than a downside

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What Are Pokmon ETBs

Why Choose QPMN for Print-on-Demand Booster Packs

This is exactly what the card Symbol of Friendship is based on

To be clear: This is a far, far worse Giant Growth than Giant Growth