Perseverance

Perseverance is a Watcher uncommon skill that Retains, starts at 5 Block, and gains 2 additional Block each turn it's held in hand without being played. Held for 1 extra turn it provides 7 Block, 2 more turns gives 9 Block, and so on. This scaling mechanic rewards waiting: the longer you hold Perseverance, the more Block it provides when finally played. Like Windmill Strike's damage scaling, Perseverance turns patience into increasingly powerful defense.

Perseverance is best in builds where you can afford to hold defensive cards across turns while still managing incoming damage — typically Calm-cycling decks that generate energy and draw cards consistently. Holding Perseverance for 2-3 turns while generating extra energy builds it up to 9-11 Block, competitive with the best defensive cards for no extra cost. Multiple copies stack independently. Upgraded, Perseverance starts at 7 Block and still gains 2 per Retain turn, providing 7, 9, 11... making the initial and scaled values both stronger.