Machina Gearframe

Edison Card Text
① When Normal Summoned: You can add 1 "Machina" monster from your Deck to your hand, except "Machina Gearframe".
② Once per turn: you can activate 1 of these effects; ● Target 1 Machine you control; equip this monster to that target.
● Unequip and Special Summon this card in Attack Position.
③ If a monster equipped by this card's effect would be destroyed, destroy this card instead.
© A monster can never be equipped with more than 1 Union Monster.
Targets
Note: when it becomes an Equip Card
No Damage Step effect
Banlist • Unlimited
Interactions
If Demise destroys the field, can Gearframe protect Fortress by being destroyed instead?✓
Demise resolves while Fortress is equipped with Gearframe.
No. Demise destroys both of them, so Gearframe cannot replace Fortress's destruction in this case.
If Icarus Attack destroys Machina Fortress and an equipped Gearframe, are both destroyed?!
Gearframe is equipped to Fortress and both are chosen by Icarus Attack.
Yes. Both are destroyed by Icarus Attack in that scenario.
Rulings
edisonformat.net
These rulings apply to all Union Monsters: https://edisonformat.net/rules/compendium/union-monsters
edisonformat.com
(1) When this card is Normal Summoned, you can add 1 "Machina" monster, except "Machina Gearframe", from your Deck to your hand. (2A) Once per turn, during your Main Phase, you can equip this card to a Machine-Type monster you control as an Equip Card, OR (2B) unequip it to Special Summon this card in face-up Attack Position. ((C) A monster can only be equipped with 1 Union Monster at a time. (3) If the equipped monster would be destroyed, destroy this card instead.)
The (1) optional Trigger Effect activates in the Summon response timing (like "Trap Hole").
The "
When... you can...
" effect can miss the timing if "Machina Gearframe" is Normal Summoned as Chain Link 2+ by the effect of "Ultimate Offering".
The (2A) Ignition Effect targets a Machine-Type monster you control.
If the target is no longer Machine-Type, Gearframe is destroyed by game mechanic.
If the target is flipped face-down / leaves the field, Gearframe is destroyed by game mechanic.
If the equipped monster is flipped face-down / leaves the field, Gearframe is destroyed by game mechanic immediately.
A Union Monster that is attached to a monster is treated as an Equip Spell Card.
If "Dimensional Fissure" is active when an equipped Union Monster is sent to the Graveyard, it will not be banished, because it was treated as a Spell and not a monster [REF]].
The (2B) Ignition-like Effect is the effect of a Equip Spell Card.
If you have no open Monster Card Zone when this effect resolves, send this card to the Graveyard.
If the equipped monster is flipped face-down / leaves the field before this effect resolves, this card is immediately destroyed and sent to the Graveyard and is not Special Summoned.
You can activate this effect even if your opponent controls the equipped monster.
The (C) Condition applies always. A monster can never be equipped with more than 1 Union Monster.
The (3) Continuous-like Effect is the effect of a Equip Spell Card.
Apply this effect if the equipped monster would be destroyed by battle or card effect.
If an effect (ex: "Black Rose Dragon") would simultaneously destroy Gearframe and the equipped Machine-Type monster; destroy both cards, you CANNOT apply this effect [REF]].
This does not apply if the equipped monster would be removed from play, returned to the hand / Deck, or flipped face-down by a card effect.