This article is in need of research. You can help out by editing this article or discussing your findings on the talk page. The editor who added this notice elaborates: find the new shield value, they definitely didn't just fix it properly lol (or maybe they did?)
As the card art suggests, the main use of Shields Down is to stop Obyn Greenfoot's shield scaling from becoming overwhelmingly large. It's a counter to full Obyn Control decks.
As an Obyn Control player, use Corvus Academy of Arts if the opponent uses Shields Down to break your Obyn's shields. In a pinch, this can be used to prevent OTK combos from being performed.
Shields Down is also a counter to Draining Bloon, and more specifically the Draining Bloon + Double Trouble combos that pile up excessive shield.
It's not usually necessary to equip more than one of this card, as this is a niche card that specifically is equipped with the incentive of beating Obyn or Draining Bloon, but typically not both.
Gallery
This article or section needs more screenshots. See the screenshot guidelines for more information on what screenshots are needed and how to add them. The editor that added this notice elaborates: Obyn with a shield value ending in 1, and also a shield vs no shield comparison (don't copypaste that reddit post but this post gives an idea of what to showcase
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Trivia
This card was the only way to create shield and lives not divisible by 5, due to an oversight by the developers. Only Obyn Greenfoot could achieve a non-divisible life count as he can reach 1000+ shield via his cards and passive.