Unlike physical board games or older console titles, these live-service games exist in a constant, perpetual state of evolution and refinement.

These patches are absolutely critical to the survival of the game; without them, the meta would quickly stagnate into one or two unbeatable decks, and the player base would abandon the game out of sheer boredom.
Balancing the Arena
If a card is being used in 40% of all top-ladder decks and has a 58% win rate, it is mathematically overpowered and will receive a 'Nerf' (a reduction in stats, like lower hitpoints or slower attack speed).

The developers must be incredibly careful, as a tiny 4% damage reduction on a single spell can completely destroy an entire deck archetype.
It is guaranteed to be nerfed in the next update.Let the pros figure out the new broken interactions first.Changing a unit's speed from 'Fast' to 'Medium' might actually help it build larger pushes. New Mechanics and 'Power Creep'
To keep the game fresh and generate revenue, developers consistently introduce brand new cards with entirely unique mechanics.

If a new 4-elixir ranged unit is released that deals more damage and has more health than the classic 4-elixir Musketeer, there is zero reason to ever play the Musketeer again.
Game MechanicThe LegacyIntroduction of 'Champion' AbilitiesAdded a massive layer of micro-management; players now had to time active abilities during combat rather than just placing unitsIntroduction of 'Evolution' MechanicsAllowed classic cards to gain massive power spikes after being cycled a certain number of times, heavily favoring fast cycle decks The Constant Evolution
Do not complain when the meta shifts; adapt to it.

Evolve or be destroyed.

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