Counting the cards in every players hand could easily leave this with 20 or more power
In fact, there are even ways to get around needing 'basic' Energy cards at all

(auras, buffs, mutate): Spellwild Ouphe, Elderwood Scion First Kicked: Vine Gecko Historic: Ballad of the Black Flag Not your turn: Geyser Drake Aura and Equipment: Golden-Tail Trainer Next Spell (honorable mention?): Hardened Berserker, Saheeli, the Gifted Pay counters instead: Mutated Cultist Dragons: Nogi, Draco-Zealot Alchemy, Dinosaurs: Scalespeaker Shepherd (Not sure why is isn't linking, but I promise it exists) Alchemy, from graveyard: Shellfish Scholar Instants and Sorceries MV5+: Spectacle Mage Prepared: Uvilda, Dean of Perfection Flip Undaunted keyword: Durnan of the Yawning Portal First instant/sorcery, conditional: Eluge, the Shoreless Sea, God-Eternal Kefnet Alchemy, Goblin: Goblin Influx Array Next instant/sorcery (honorable mention?): Maelstrom Muse Face-down: Panoptic Projektor Doctors: The Eleventh Hour Cards from exile: Commander Liara Portyr Next instant/sorcery, conditional: Elminster Spells you don't own: Gonti, Canny Acquisitor plakjekaas on What is the Difference Between 2 years ago If something is not a trigger, like an activated ability (boast on Axgard Braggart) or an alternate way of casting a spell (like with As Foretold), then it would not make sense to say it triggers once per turn

Whats more, the attack Ascension makes me wonder (and hope) if we might be in store for some powerful Eeveelution ex cards in the near future
Im thinking of a surprise Spore Frog off Chord of Calling or an unexpected Glacial Chasm from Crop Rotation or Elvish Reclaimer
The average cost of all ten of these decks is roughly around $73 at this point in time in paper, based on the average cost of the deck given on the site