King Cards

King Cards (Japanese: カード Kingu Kādo) are cards created by KuugaUltimate200 (aka DragonRikaZangetsu at DevianART) with golden-colored frames that resemble gold tablets. They're introduced at "Kingship of the Duelist" alongside Master Rule ROYAL. They are placed in the, and work like Spell and Trap cards do, with the added ability to unlock "King Monster Zones" on the Field to Special Summon monsters from the Extra Deck to the Main Monster Zones without the need of Link Monsters.

Design & Theme
King cards have golden-colored frames that resemble gold tablets, with the kanji for King engraved on it. In many cultures the color gold is associated with kings, for example: In Japan this color symbolizes strength and wealth, two things associated with kings, and since these cards give more power and freedom to the player, that's possibly why this color was chosen.

Basic Functions
King Cards are cards that can be placed on the Spell & Trap Zone and function similarly to them, but with the added ability to unlock "King Monster Zones" on the Field to Special Summon monsters from the Extra Deck without the use of Link Monsters.

Unlocking King Monster Zones
King Cards can help Special Summon monsters from the Extra Deck by treating a number of Main Monster Zones on the field as "King Monster Zones." How many King Monster Zones can be unlocked is indicated by a King card's King Hierarchy. King Monster Zones are unlocked prior to the activation of a King card's effect(s). Unlocking King Monster Zones does not start a chain because it is not a card effect.

King Hierarchy
The King Hierarchy is a number beside this symbol that is placed on the left of King cards (similar to the Link Rating from Link & Lock Link monsters). It indicates how many King Monster Zones can be unlocked (The player can choose which Zones to unlock.)

Spell Indicators
On the right side of the King Cards, there are up to two icons that look like those on Spell/Trap Cards. These indicators describe the function of the King Cards as well as their Spell Speed.

The first icon can be the following:

If it has this icon ; the card is treated to be a Quick Effect, making it a Spell Speed 2 card.

if it has this icon ; the card must remain on the field after activation because it is treated as a Continuous card.

if it has this icon ; the card must be placed on the Field Zone and is treated as a Field card.

if it has this icon ; is treated as if it were a Counter card, making the card a Spell Speed 3 card.

if it has this icon ; the card is treated as an Equip card.

If it has this icon ; the card is treated as a Ritual card.

If it has this icon ; the card is treated as a Shield card.

The 2nd icon can only be whether, , , or.

King Monster Zones
For more information see "King Monster Zones"
 * King Monster Zones can only be unlocked by King cards
 * A King card's King Hierarchy determines the number of Unlockable King Monster Zones (You can choose those zones.)
 * Before using it to unlock a King Monster Zone, the Main Monster Zone(s) must be empty. Monster Zones that are occupied cannot be used.
 * When a monster Special Summoned from the Extra Deck leaves a King Monster Zone (by being destroyed, banished, or sent back to the Extra Deck/hand), that zone reverts to a Main Monster Zone; however, you can still re-unlock that same King Monster Zone during your turn with another King Card.
 * King cards can continue to unlock King Monster Zones up to their King Hierarchy during each of your turns while they are face-up in your field if they are treated as Continuous or Field cards by their Spell Indicators.
 * King Cards cannot unlock the same King Monster Zones that they previously unlocked, even if that same King Monster Zone has been reverted to a Main Monster Zone. If Continuous or Field King Cards haven't used up all of their King Hierarchy in the same turn, they must unlock other Zones that haven't been unlocked yet with that same card.
 * A King Monster Zone is still treated as such even if a Link Monster's Link Arrows are pointing there.
 * The 2 Extra Monster Zones cannot be used to Unlock King Monsters Zones.
 * You can Special Summon monsters from the Extra Deck to Monster Zones that a Link Monster's Link Arrows point to if it is Summoned to a King Monster Zone.
 * Even if a King card leaves the Field, a King Monster Zone(s) remains unlocked for the remainder of the turn, unless it is reverted to a Main Monster Zone by card effects.
 * During each player's End Phase, empty King Monster Zones are reverted to Main Monster Zones.

King Summoning
For more information see "King Summoning".
 * When a monster is Special Summoned from the Extra Deck to a King Monster Zone, it is treated as a King Summon.
 * The word “King” is added to the summoning type of that monster.
 * King [insert summoning type] Summon
 * King Fusion Summon
 * King Synchro Summon
 * King Xyz Summon
 * King Pendulum Summon
 * King Link Summon
 * Etc.
 * Despite being treated as "King Summoning", Special Summoning monsters from the Extra Deck is still treated as it's corresponding Summoning type. King Summon is just a PSCT term to reduce card text.
 * King Summoning can still be negated by cards like "" and other cards.

Regarding Master Rule Revision 2020
Since that new Master Rule will allow Fusion, Synchro and Xyz monsters to be Special Summoned to the Main Monster Zone without the Extra Monster Zone restriction, many would think these cards are now completely pointless, but since Pendulums and Links are still under that restriction, these cards can still be useful to summon those overriding that restriction.

Also a new Master Rule has been made by KuugaUltimate200 to fit for these cards' usage.