In Boros Energy, specifically, it fits perfectly into a game plan that wants to apply pressure quickly, build out the battlefield, and punish opponents for stumbling even a little
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Q: My opponent has a Tarmogoyf out and only has a Creature, Sorcery, Artifact, and an Enchantment in the yard
The first time someone goes to attack over your team with flying or with your creatures tapped, and you cast a fat Dragon and block and kill their attacker
Great for digging, dropping them into your graveyard for recursion for Academy Ruins and then be up a card too
Blastoise ex isn't a common deck, but it's uniquely threatening to Arcanine ex