For No Cost

For No Cost refers to various card abilities that allow you to play other cards without tapping any cards in your mana zone and paying for its cost.

Details
Most of these cards include (コストを支払わずに, Kosuto o shiharawazu ni') "for no cost" in their card text.

It refers to mainly cards that do the following;
 * Cards that allow you to play them;
 * Spells that you can cast for no mana cost.
 * Cross Gears that you can generate for no cost.
 * Cross Gears that you can be crossed to creatures for no cost.
 * Creatures (including Psychic Creatures) that you can put into the battle zone for no mana cost.

Named Abilities such as "Shield Trigger", "Gravity Zero" and "Strike Back" and "Ninja Strike" allow you to play creatures and spells for no cost when the varying conditions are met.

Unnamed abilities such as "Reanimate" and "Recruit" are a kind of "for no cost" ability, even though they don't specifically mention the phrase in the card text.

Abilities that allow you to play cards "For No Cost"

 * Keyword Ability
 * Shield Trigger
 * Shield Trigger Cross
 * Strike Back
 * Knightly Generation
 * Ninja Strike
 * Samurai Magic
 * Samurai Generation
 * Chain
 * Chain Cascade
 * Rebirth Chain
 * Language Ability
 * Gravity Zero
 * Revenge Chance
 * Attack Chance
 * Other
 * Madness
 * Reanimate
 * Recruit

Typical "For No Cost" cards"

 * Kyrstron, Lair Delver
 * Magmadragon Balga Geyser
 * Balga Raiser, the Dragonic Meteor
 * Transmogrify
 * Rapid Reincarnation
 * Soulswap
 * Crest of Mother
 * Inferno Gate
 * Amaterasu, Founder of the Blue Wolves
 * Emperor Chirico
 * Sanctuary of the Mother
 * The Door of Miracle and Mystery
 * Orochi, of the Hidden Blade
 * Hogan Blaster
 * Hyperspatial Spells
 * Kachua, Keeper of the Icegate