Malleable Impostor

Mana cost: {3}{U}
Type: Creature — Faerie Shapeshifter
Power / toughness: 0 / 0
Set: Wilds of Eldraine Commander #10 (rare)
Price: $5.33 USD

Flash
Flying
You may have this creature enter as a copy of a creature an opponent controls, except it's a Faerie Shapeshifter in addition to its other types and it has flying.

Malleable Impostor has 2 printings, first in Wilds of Eldraine Commander (2023). EDHREC ranks it #4,630 among Commander cards. It appears most in Alela, Cunning Conqueror decks (10,969 on EDHREC). 1 public deck on TCG runs it. It has 7 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Malleable Impostor

Fae Dominion - Wilds of Eldraine Commander, led by Tegwyll, Duke of Splendor

Commanders that run Malleable Impostor most

Deck counts from EDHREC.

Often played with Malleable Impostor

Cards that show up in the same decks on EDHREC.

Rulings

2023-09-01: If the chosen permanent is a token, Malleable Impostor copies the original characteristics of that token as stated by the effect that put the token onto the battlefield, with the listed exceptions. Malleable Impostor does not become a token.
2023-09-01: If the chosen permanent is copying something else (for example, if the chosen permanent is a Clone), then your Malleable Impostor enters the battlefield as whatever the chosen permanent copied, with the stated exceptions.
2023-09-01: If the chosen permanent has {X} in its mana cost, X is 0.
2023-09-01: If Malleable Impostor somehow enters the battlefield at the same time as another creature, Malleable Impostor can't become a copy of that creature. You may choose only a creature that's already on the battlefield.
2023-09-01: You can choose not to copy anything. In that case, Malleable Impostor simply enters the battlefield as a 0/0 creature and is probably put into your graveyard immediately, unless something else is increasing its toughness to keep it alive.
2023-09-01: Except for the listed exceptions, Malleable Impostor copies exactly what was printed on the original permanent and nothing more (unless that permanent is itself copying something or is a token; see below). It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or any noncopy effects that have changed its power, toughness, types, color, and so on.
2023-09-01: Any enters-the-battlefield abilities of the copied permanent will trigger when Malleable Impostor enters the battlefield. Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the chosen permanent will also work.