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card
silent
skill
rare
Although nightmare might look unremarkable, this card can be completely game winning in the right scenario. For example, if you cast Nightmare on an upgraded catalyst, you can triple something’s poison 4 times (x81 poison). Well-laid Plans is a must-have if you are taking nightmare in order to retain either the card to be copied or nightmare itself. This card often requires a lot of energy because it is difficult to play this without taking damage. For this reason I would also recommend upgrading it. It tends to be more useful in boss fights when you are able to copy an important power or skill.

Ancient Tea Set
common
Whenever you enter a Rest Site, start the next combat with 2 Energy.
C-

Art of War
common
If you do not play any Attacks during your turn, gain an extra Energy next turn.
C

Happy Flower
common
Every 3 turns, gain 1 Energy.
C

Lantern
common
Gain 1 Energy on the first turn of each combat.
B+

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

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

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

Sundial
rare
Every 3 times you shuffle your deck, gain 2 Energy.
C

Ectoplasm
boss
Gain 1 Energy at the start of each turn. You can no longer gain Gold.
A-

Philosopher's Stone
boss
Gain 1 Energy at the start of each turn. ALL enemies start with 1 Strength.
B

Snecko Eye
boss
Draw 2 additional cards each turn. Start each combat Confused.
A-

Sozu
boss
Gain 1 Energy at the start of each turn. You can no longer use potions.
A

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

Busted Crown
boss
Gain 1 Energy at the start of each turn. On Card Reward screens, you have 2 fewer cards to choose from.
A+

Fusion Hammer
boss
Gain 1 Energy at the start of each turn. You can no longer Smith at Rest Sites.
A

Coffee Dripper
boss
Gain 1 Energy at the start of each turn. You can no longer Rest at Rest Sites.
B

Incense Burner
rare
Every 6 turns, gain 1 Intangible.
A+

Nunchaku
rare
Every time you play 10 Attacks, gain 1 Energy.
B+

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

Slaver's Collar
boss
During Boss and Elite combats, gain [energy] at the start of your turn.
B-