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card
watcher
skill
rare
Spirit shield is one of the strongest cards at the watcher’s disposal. It very consistently generates a lot of block, particularly due to how many of the watcher’s cards have retain. This even includes the miracle that you obtain due to your starting relic. I don't think you can ever have too many copies.

Bag of Preparation
common
At the start of each combat, draw 2 additional cards.
B+

Bronze Scales
common
Start each combat with 3 Thorns.
C

Centennial Puzzle
uncommon
The first time you lose HP each combat, draw 3 cards.
B-

Gremlin Horn
uncommon
Whenever an enemy dies, gain 1 Energy and draw 1 card.
B+

Mercury Hourglass
uncommon
At the start of your turn, deal 3 damage to ALL enemies.
C

Runic Dodecahedron
uncommon
If your HP is full, gain 1 Energy at the start of each turn.
D-

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

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

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

Torii
rare
Whenever you would receive 5 or less unblocked Attack damage, reduce it to 1.
C+

Runic Pyramid
boss
At the end of your turn, you no longer discard your hand.
B-

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-

Stone Calendar
rare
At the end of turn 7, deal 52 damage to ALL enemies.
D

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

Ink Bottle
uncommon
Whenever you play 10 cards, draw 1 card.
D