"Aniform" is an attribute found across many worlds, but there is usually one representative of this attribute per world. It is used by the Werbeast King in Future Card Buddyfight NX.
The Werbeast King is a shapeshifting magician who comes from Magic World on occasion to play tricks on the human world. He usually appears in the form of a dog with a ferocious bite, but his true form is a chimera-like creature taking on attributes from several animals. His bite infects his victims with a spell that turns them into animals. These victims are then controlled by the Werbeast King as his Aniform servants.
Most of the Aniform monsters are based on characters in Future Card Buddyfight NX. This is a reference to the Werbeast King's ability to infect humans with his shapeshifting curse.
Aniform has a keyword exclusive to it, [Soul Gauge]. [Soul Gauge] refers to the ability to add cards from the gauge to the soul, while still being considered part of the gauge, and being able to use that Soul Gauge for costs.
Aniform relies on keeping Werbeast King on the field as long as possible, so it can amass more Soul Gauge. Several Aniform monsters have the ability to destroy themselves so they can protect the monster in the center so it doesn't lose those precious Soul Gauges. This skill is similar to CHAOS Drain in that respect.
Soul Gauge Reminder Text
|[Soul Gauge] (Once per turn, you may place a card from your gauge under this card face down. The card is considered part of your gauge and this card's soul.)|