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card
silent
power
uncommon
Caltrops can work well in silence due to her ability to stack up absurd amounts of block. Although this won't when encounters on its own, it is particularly powerful versus Hexaghost, the heart, and annihilates the birds. For this reason I would consider picking one up in act one especially if I know I will be fighting Hexaghost. Beyond this point, any additional copies of caltrops should only be considered for their dps against the heart.

Anchor
common
Start each combat with 10 Block.
B+

Bronze Scales
common
Start each combat with 3 Thorns.
B-

Orichalcum
common
If you end your turn without Block, gain 6 Block.
B

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

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+

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

Calipers
rare
At the start of your turn, lose 15 Block rather than all of your Block.
C+

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

Thread and Needle
rare
At the start of each combat, gain 4 Plated Armor.
A+

The Abacus
shop
Gain 6 Block whenever you shuffle your draw pile.
C-

Horn Cleat
uncommon
At the start of your 2nd turn, gain 14 Block.
B+

Captain's Wheel
rare
At the start of your 3rd turn, gain 18 Block.
B+