|Whenever anything is Shroom'd, double the amount and lose 1 Scrap
The strength of the Shroominator is its ability to double Shroom applied to a card, at the cost of its own Scrap. Because it activates for each individual infliction of Shroom, the Shroominator is most effective with a card like Fungun who can apply large amounts of Shroom at once, which when doubled can easily reach lethal levels. On the other hand, the Shroominator is generally ineffectual if paired with cards like Wort who apply low quantities of Shroom multiple times, as the Shroominator will quickly lose Scrap for smaller gain.
If multiple cards are Shroomed simultaneously (such as by the Spore Pack), the Shroominator activates for each one, doubling all affected cards' Shroom. This happens even if more targets are Shroomed than the Shroominator has Scrap; for instance, if the Spore Pack Shrooms 3 enemies while the Shroominator has 1 Scrap, it will still double the Shroom of all 3 enemies and is destroyed afterwards. This may be a bug.
If multiple Shroominators are on the field, only one of them activates when something is Shroomed.
Outside of a Shroom-focused deck, the Shroominator is notable for having a whopping 4 Scrap, the second-highest of any Clunker (behind Plinker, who also loses Scrap every turn). This allows it to simply block multiple strong hits for the team. However, be aware that the Shroominator triggers whenever the player's cards are inflicted with Shroom as well, which poses a problem in the fights with The Noxious Shrooms and Truffle.