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card
silent
attack
common
If you have at least one or two sources of poison in your deck, this card is usually worth it. It's a decent amount of damage for 1 energy, and scales fairly well with strength. It is in a strange place, because typically if you are running a deck that focuses on poison you don't need want or big attacks. Nonetheless, this works very reliably with cards like crippling cloud and noxious fumes.

Snecko Skull
common
Whenever you apply Poison, apply an additional 1 Poison.
S+

The Specimen
rare
Whenever an enemy dies, transfer any Poison it has to a random enemy.
A-

Twisted Funnel
shop
At the start of each combat, apply 4 Poison to ALL enemies.
B

Vajra
common
At the start of each combat, gain 1 Strength.
A

Molten Egg
uncommon
Whenever you add an Attack card to your deck, it is Upgraded.
A-

Shuriken
uncommon
Every time you play 3 Attacks in a single turn, gain 1 Strength.
S

Sling of Courage
shop
Start each Elite combat with 2 Strength.
D+

Akabeko
common
Your first Attack each combat deals 8 additional damage.
C+
No silent, colorless or curse cards antisynergies.