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card
silent
power
uncommon
Accuracy is an all or nothing card. If you are running a shiv deck and you expect to beat the heart at ascension 20, you must normally run at least one Accuracy. The time-eater greatly counters shiv decks and accuracy allows each card to be worth playing. The same goes for the heart. I would never pick accuracy unless the deck's win condition was solely shivs.

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

Frozen Egg
uncommon
Whenever you add a Power card to your deck, Upgrade it.
B+

Kunai
uncommon
Every time you play 3 Attacks in a single turn, gain 1 Dexterity.
S-

Mummified Hand
uncommon
Whenever you play a Power, a random card in your hand costs 0 for the turn.
B-

Ornamental Fan
uncommon
Every time you play 3 Attacks in a single turn, gain 4 Block.
C+

Shuriken
uncommon
Every time you play 3 Attacks in a single turn, gain 1 Strength.
S

Bird-Faced Urn
rare
Whenever you play a Power, heal 2 HP.
B+

Gambling Chip
rare
At the start of each combat, discard any number of cards then draw that many.
A

Unceasing Top
rare
Whenever you have no cards in hand during your turn, draw a card.
B-

The Boot
common
Whenever you would deal 4 or less unblocked Attack damage, increase it to 5.
C

Dead Branch
rare
Whenever you Exhaust a card, add a random card to your hand.
S

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-

Strange Spoon
shop
Cards which Exhaust when played will instead discard 50% of the time.
C-