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card
silent
skill
uncommon
Concentrate is very difficult to use efficiently due to the heavy number of cards that it discards. Unless you're running a deck which has a considerable amount of draw, it is usually impossible to spend all of the energy generated by the card. The one main exception for this rule is unceasing top, as even if you run out of cards you will continue to draw some until you run out of energy or hit a curse or status card. Ice Cream also works well with Concentrate. Take with caution.

Ring of the Snake
starter
At the start of each combat, draw 2 additional cards.
B

Tough Bandages
uncommon
Whenever you discard a card during your turn, gain 3 Block.
C

Ring of the Serpent
boss
At the start of your turn, draw 1 additional card.
B

Hovering Kite
boss
The first time you discard a card each turn, gain [energy].
B+

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

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.
D+

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

Letter Opener
uncommon
Every time you play 3 Skills in a single turn, deal 5 damage to ALL enemies.
A

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

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

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

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