When used, it drops the HP of all monsters to 1. Keep in mind that this does not activate the ability of cards like Big Bob or MTT Fountain.
Best used later in game against powerful monsters and usually in tandem with Woshua due to its effect dealing 1 DMG to all enemy monsters. Fox Head is limited to the enemy monsters at either side, though this may be all that's needed. And to avoid negative RNG, Crazy Bun is limited to use when you have no other monsters.
Undyne can also work, but this is not recommended due to her price. Spade King also goes well with this card.
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