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Familiarise with Your Deck : Play numerous games with your deck to gain familiarity with card interactions
With that said, for me this list begins with Aethersquall AncientAethersquall Ancient, which while expensive, is the threat that I have seen win energy decks the game time and time again
Because all the cards in a color can be cast using that same type of land, they are vastly more likely to appear in the same decks, leading to consistent, recognizable play styles across decks which play that color
It looks like the lore items got lost or maybe taken in the ink flood that also caused the Floodborn versions of characters
Even if youre just playing Auspicious Starrix in your non-mutate deck, turning something small into a 6/6 plus another permanent is well worth the six mana