Slider Monster

Slider monsters (Japanese: スライダー Suraidā, "Slider") are monsters with "Slider" listed on the Type/Ability line. They are required for the Distortion Summon of a Distortion Monster, similarly to how Tuners are required for Synchro Monsters.

Similarly to how Pendulum Monsters posses both a Monster Effect and a Pendulum Effect in two separate boxes, Slider monsters possess a Monster Effect and a Slider Effect, an effect that is active only while the Slider is in the Slider Zone. All of these Slider Effects always include a "Rewrite Cost" and conditions that allow a player to Rewrite any of their Phases.

The first known Slider monster was "Chronos Magician Girl".

Mechanics
When the conditions explained in the Slider Effect of the Slider monster are met, a player may pay the Rewrite Cost, which is also listed in the Slider effect, in order to Rewrite the specified Phases(s), after which, one of two things can happen to the Slider monster;
 * The Slider monster can be used for the Distortion Summon of a monster whose Summon conditions are fulfilled by the Slider monster (i.e., correct level, Rewrite of a certain phase, etc.), in which it is placed under the Summoned Distortion Monster as a material.
 * If the Slider monster is not used for a Distortion Summon, it is removed from the game (not banished) and cannot be used or retrieved for the remainder of the Duel.

Slider Distortion Monsters
Most if not all Slider monsters are usually Effect Monsters that are placed in the Main Deck at the start of the Duel. However, the primary exception to that fact is "Chronos-Eyes Magician Girl", a Slider monster that is also a Distortion Monster, similarly to Extra Deck Pendulum Monsters. Like the aforementioned, a Slider Distortion Monster must be placed in the Extra Deck at the start of the Duel and must be placed into the Slider Zone in order to use its Slider Effect. The same rules that apply for Slider monsters also applies for Slider Distortion Monsters.