Card Zone Transitions

A card leaving a zone is a game action with a defined destination — the effect sending it says where it goes, and the destination determines which triggers fire. "Returned to the Extra Deck," "flipped face-down," and "sent to the GY" are three distinct transitions with very different downstream effects.

Extra Deck Fusion monsters — "returned to the Extra Deck"

When a Fusion Monster is bounced back to the Extra Deck (Storming Mirror Force, Compulsory Evacuation Device from the field, certain Fusion recyclers), the act of leaving the field still counts as "leaves the field" for trigger purposes. The monster doesn't go to the GY; it returns face-down to the Extra Deck. However, because the card is returned face-down to the Extra Deck, it may no longer trigger because face-down cards can no longer activate their trigger effects (face-up cards in the Extra Deck I.E. Pendulum Monsters can still trigger), unless specified otherwise.

Elemental HERO Absolute Zero

"When this card leaves the field: Destroy all monsters your opponent controls."

Absolute Zero's trigger reads "leaves the field," not "is sent to the GY." The trigger fires on any transition out of the Monster Zone, including being returned to the Extra Deck by Storming Mirror Force. However, because it returns to the Extra Deck face-down, it cannot activate its effect. This applies similarly for the case of Absolute Zero being banished face-down by the likes of Kashtira Fenrir.

A Trap that becomes a Monster — Shapesister

Shapesister

Shapesister — "Special Summon this card as a Normal Monster (Fiend-Type/Tuner/EARTH/Level 2/ATK 0/DEF 0). (This card is also still a Trap Card.) You can only activate 1 'Shapesister' per turn."

Shapesister is a Continuous Trap that activates by Special Summoning itself as a Normal Monster to the Monster Zone. While in the Monster Zone in this state, the parenthetical reminder ("This card is also still a Trap Card.") means it is simultaneously a Monster Card and a Trap Card — effects that target Trap Cards on the field still see it. If it leaves the field, the destination is determined by the effect that moved it (no special "return to S/T Zone" clause exists in the text).

Worked examples

"During his turn, Jaden has his Elemental HERO Absolute Zero attack Chazz's Armed Dragon LV 7. In response to the attack, Chazz activates Storming Mirror Force to send Elemental HERO Absolute Zero back to the Extra Deck. Does Elemental HERO Absolute Zero activate its effect upon leaving the field?"

— Answer: No. Absolute Zero's trigger is "If this card leaves the field," not "when this card is sent to the GY." Returning to the Extra Deck is still a "leaves the field" transition. However, because it returns to the Extra Deck face-down, it can not longer activate its trigger effect.

"Shapesister is on the field as a Normal Monster (via its own activation). Mystical Space Typhoon targets and destroys it. Where does Shapesister go?"

— Answer: To the Graveyard. Shapesister is simultaneously a Monster and a Trap on the field, but a "destroy" effect routes destroyed cards to the GY by default — there is no card text on Shapesister that redirects this destination.

Field-applied name changes stop when the card changes zones

An effect that changes a monster's name while it is on the field normally stops applying when that monster leaves the field. The card in the GY is the same physical card, but it is a new game object for continuous field-applied effects; as a retrieval phrase, treat this as the same-card / new object distinction. Do not carry a field-only name change into the GY unless the effect explicitly says it applies there too.

Red-Eyes Fusion — "If you Fusion Summon using this card, you cannot Normal or Special Summon other monsters for the rest of this turn. The Fusion Summoned monster's name becomes 'Red-Eyes Black Dragon'."

"I Fusion Summoned Archfiend Black Skull Dragon with Red-Eyes Fusion, so its name became Red-Eyes Black Dragon on the field. When it is sent to the GY, is its name still Red-Eyes Black Dragon?"

— No. The name change applied to the monster on the field. Once the monster leaves the field and becomes a GY object, that field-applied name change no longer applies; in the GY it is Archfiend Black Skull Dragon again.

"Return to the hand, and if you do" fails for Extra Deck monsters

When an effect specifically says to return a monster to the hand, an Extra Deck monster that would

be returned there goes to the Extra Deck instead by game rule. That destination substitution is not

the same as successfully returning it to the hand for an "and if you do" condition. If the next

part of the effect depends on "if you do" return it to the hand, skip that next part.

Dragonmaid Downtime — "Target 1 'Dragonmaid' monster you control; return it to the hand, and if

you do, add 1 'Dragonmaid' card from your Deck to your hand, except 'Dragonmaid Downtime'."

"I target a Fusion Monster such as House Dragonmaid with Dragonmaid Downtime. It goes to the

Extra Deck instead of the hand. Do I still search?"

— No. The targeted monster was not returned to the hand, so the "and if you do" condition is not

satisfied and the add/search part is not performed. Also check any separate trigger carefully: a

trigger that requires a card to be returned to the hand does not trigger merely because an Extra Deck

monster went to the Extra Deck.

Judge calls to watch for

• Check the Trigger's wording precisely: "leaves the field," "sent to the GY," "destroyed by battle," "sent to the GY by an opponent's card effect" all have distinct conditions.
• Continuous or field-applied name changes usually stop when the card changes zones. The GY card is a new game object for that effect, so do not carry a Red-Eyes Fusion-style field name into the GY.
• Returning an Extra Deck monster to the Extra Deck is not the same as returning it to the hand for an

"and if you do" hand-return gate; the follow-up search/add is skipped if that gate is not met.

• Returning to Extra Deck / Deck are not valid "leaves the field" events, and neither are "sent to the GY."
• If a monster is returned face-down to the Extra Deck, it becomes a legitimate re-Summon target.

Sources

• Konami Rulebook v10
• YGOrganization rulings on "leaves the field" triggers
• Red-Eyes Fusion / Archfiend Black Skull Dragon name-change handling: field-applied name changes stop applying after the monster leaves the field unless the effect says otherwise.