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card
watcher
attack
uncommon
Can serve as a win-condition. The +damage effect is doubled when you take wrath into account (+10 per turn upgraded), or tripled if you're running a divinity deck (+15 per turn upgraded). Its retain effect makes it easy to play on wrath/divinity turns so it makes a great finisher.

Pen Nib
common
Every 10th Attack you play deals double damage.
A

Molten Egg
uncommon
Whenever you add an Attack card to your deck, it is Upgraded.
A-

Snecko Eye
boss
Draw 2 additional cards each turn. Start each combat Confused.
A-

Velvet Choker
boss
Gain 1 Energy at the start of each turn. You cannot play more than 6 cards per turn.
A-

Pocketwatch
rare
Whenever you play 3 or less cards in a turn, draw 3 additional cards at the start of your next turn.
C-

Strike Dummy
uncommon
Cards containing "Strike" deal 3 additional damage.
D