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card
silent
skill
common
Blade Dance is obviously very important to shiv decks, but on top of this it also synergises very well with certain relics. Kunai and Shuriken are perhaps the two most notable ones (always upgrade quickly if you have these), but relics like Ink Bottle, Pen Nib, and any others that trigger after a certain number of cards or attacks have been played also have great synergies with this. Be aware of the time eater and the heart.

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

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

Toxic Egg
uncommon
Whenever you add a Skill card to your deck, it is Upgraded.
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

Ink Bottle
uncommon
Whenever you play 10 cards, draw 1 card.
D+
No silent, colorless or curse cards antisynergies.

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-