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However, well need to wait a bit longer to see its full effects since Mew ex is still a relatively new card

As far as strategy is concerned with this card since Lugia needs 3 different types of energy to perform Elemental Blast I would make sure that your deck includes 1 or 2 of these different energies and also to use 4 each of multi-energy, double-colorless, and rainbow energy in your deck to account for the wide variety of energy types needed to perform Elemental Blast

The Poke-Power Darker Ring has you swapping out your opponents active Pokemon with another from their Bench

Now that you understand the board and zones, you're ready for the next step: learning how turns actually work