Cards with changeling that enter face-down cause subtype related triggers to fire.

A morph (or other face-down creature) should not have any creature types and therefore, when they enter the battlefield face-down, any triggers related to a specific creature type should not fire.

I have found that when a card with Changeling (This card is every creature type) enters face-down, it is causing subtype related triggers to fire.

**Steps to Reproduce**
On the battlefield: [[Inventor's Goggles]], [[Scroll of Fate]]
In hand: [[Changeling Outcast]]
- Activate ability of Scroll of Fate, choosing Changeling Outcast
- Observe that the ETB trigger of Artificer's Goggles is put onto the stack

[Note]
This should not affect interactions within the MKM set, as it does not contain the Changeling keyword, but it does affect interactions with other sets.

Reproduce the interaction using Inventor's Goggles, Scroll of Fate, and Changeling Outcast as described. Start by tracing Scroll of Fate's face-down entry and the subtype-related ETB trigger handling. Done means a face-down Changeling does not trigger effects tied to a specific creature type, while ordinary face-down creatures retain the expected behavior.

Written by the indexing model from the issue text.