Rare Metalmorph - Not destroyed when associated card leaves the field

YGO Omega Bugs
1
  1. Bug description

The card Rare Metalmorph was still on the field even though it should have been destroyed.

  1. Bug reproduction steps

Here’s the steps I did:

  • Summon a Y-Dragon Head
  • Activate Rare Metalmorph on Y-Dragon Head
  • Summon a X-Cannon Head
  • Associate Y-Dragon Head to X-Cannon Head using union feature
  • Summon a Z-Metal Tank
  • Do fusion summon for XYZ-Dragon Cannon

At that moment Rare Metalmorph is still on the field, even though Y-Dragon Head is not.

Unfortuately I didn’t found my replay after saving it.

  1. Expected behavior

Rare Metalmorph should have been destroyed when Y-Dragon Head left the field.

2

After Y-Dragon Head equipped itself to X-Head Cannon, it stopped being targeted by Rare Metalmorph. Similar examples can be seen with Fiendish Chain, Oasis of Dragon Souls, and Call of the Haunted.

3

What’s the expected behaviour after the equipment in other YGO games?

4

This IS the expected behavior in other YGO games. Because Y-Dragon Head doesn’t actually leave the field, it becomes a union equip, Rare Metalmorph does not get removed. It simply continues to exists.