サイレント

• Type: Skill
• Cost: 1
• Effect: If the target is Poisoned, apply 9 Poison.

Upgraded

• Cost: 1
• Effect: If the target is Poisoned, apply 12 Poison.

A conditional Skill that adds 9–12 Poison only if the target already has Poison. Even 1 Poison unlocks it, so stacking one Poison first means you get 9–12 more on the cheap. Deadly Poison then Bubble Bubble produces 5–7 → +9–12 for a 14–19 stack in two cards. Blade Burst then Bubble Bubble doubles it to 18–24 Poison in a single turn. Catalyst scales the payoff further, since every extra Poison swells the bonus trigger damage. The condition is trivial in a Poison deck, effectively turning Bubble Bubble into a 1-energy 9–12 Poison applier — one of the most efficient Poison amplifiers in the class.

• Apply Poison first (Deadly Poison, Bouncing Flask, Poisoned Stab), then follow with Bubble Bubble.
• With Tactician, retain Deadly Poison + Bubble Bubble every turn for a consistent high-Poison loop.
• Blade Burst into Bubble Bubble adds 18–24 Poison in a single turn — the Poison deck's burst ceiling.
• Stacks well with Catalyst. The bigger the Poison pile Bubble Bubble builds, the more damage Catalyst's extra proc delivers.
• Upgrade is very efficient — 12 Poison for 1 cost. Prioritize upgrading this.

• Deadly Poison: 5–7 Poison applier. Chain Deadly Poison then Bubble Bubble for a 14–19 stack from two cards.
• Blade Burst: plays the next Skill twice. Blade Burst into Bubble Bubble dumps 18–24 Poison — the Poison deck's signature burst.
• Catalyst: Poison procs 1 extra time. Bubble Bubble's large Poison stack multiplies Catalyst's damage.
• Tactician: retain at end of turn. Hold Deadly Poison + Bubble Bubble every turn for a stable high-Poison loop.

• Silent Poison Build (S-tier)