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He's expensive for what he does, and the limitation of only being able to use the mana for artifacts makes little sense in a game where we have Sol Ring, Mana Crypt, Thran's Dynamo, Worn Powerstone, Sissay's Ring, or basically any other colourless mana rock
Emerald can be an extremely fun ink colour to play for this reason, and boasts some of the best Lorcana cards in The First Chapter as a whole, allowing the opportunity to mess with rival players and become a real thorn in their side
You'll be able to "remotely" attack with Alakazam ex instead of your Active Pokemon
Styled like the Basic Energies from Scarlet & Violet, this card carries the mark of knowledge, responsibility, and effort
In other words, Achilles will come down for its reduced cost often, provide a decent threat, and buff your entire board as long as he remains on the battlefield