Theres incentive to play battles, as winning earns you XP, which helps you level up, which helps you open more booster packs, which helps you build better decks to win more battles
It's helpful to keep a master list somewhere easy to find, like the front pocket of a binder, so that you can reference it and locate a card within a group or subgroup quickly
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Atraxa, Praetors Voice is maybe the most infamous entry on this list
On top of being a very curve-friendly card, because you can play it on nearly any turn in the game with ease, it also has flying and haste
Brave Blade, does 230 damage, with the downside that Zacian can't attack during the next turn