Littjara Glade-Warden — ruling 1

Once you announce that you’re activating the activated ability, no player may take actions until the ability has been paid for. Notably, opponents can’t try to remove creature cards from your graveyard to stop you from activating the ability.

Littjara Glade-Warden — ruling 2

Changeling is a characteristic-defining ability. It functions in all zones, not only while a card that has it is on the battlefield.

Littjara Glade-Warden — ruling 3

The subtype Shapeshifter that appears on the type line is mostly there to reinforce the flavor. A creature card with changeling is just as much an Elf, a Dwarf, a Sliver, a Goat, a Coward, and a Zombie as it is a Shapeshifter.

Littjara Glade-Warden — ruling 4

If an effect causes a creature with changeling to become a new creature type, it will be only that new creature type. It will still have changeling; the effect making it all creature types will simply be overwritten.

Littjara Glade-Warden — ruling 5

If an effect causes a creature with changeling to lose all abilities, it will remain all creature types, even though it will no longer have changeling. This is because changeling applies before the effect that removes it.

Littjara Glade-Warden : règles, fonctionnement et interactions (MTG)

Littjara Glade-Warden is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Changeling (This card is every creature type.) , , Exile a creature card from your graveyard: Put two +1/+1 counters on target creature. Activate only as a sorcery.

How it works : Littjara Glade-Warden

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
Once you announce that you’re activating the activated ability, no player may take actions until the ability has been paid for. Notably, opponents can’t try to remove creature cards from your graveyard to stop you from activating the ability.
No other card is named in this ruling.
#2February 5, 2021· Wizards of the Coast
Changeling is a characteristic-defining ability. It functions in all zones, not only while a card that has it is on the battlefield.
No other card is named in this ruling.
#3February 5, 2021· Wizards of the Coast
The subtype Shapeshifter that appears on the type line is mostly there to reinforce the flavor. A creature card with changeling is just as much an Elf, a Dwarf, a Sliver, a Goat, a Coward, and a Zombie as it is a Shapeshifter.
No other card is named in this ruling.
#4February 5, 2021· Wizards of the Coast
If an effect causes a creature with changeling to become a new creature type, it will be only that new creature type. It will still have changeling; the effect making it all creature types will simply be overwritten.
No other card is named in this ruling.
#5February 5, 2021· Wizards of the Coast
If an effect causes a creature with changeling to lose all abilities, it will remain all creature types, even though it will no longer have changeling. This is because changeling applies before the effect that removes it.
No other card is named in this ruling.