Timeless Dragon

Mana cost: {3}{W}{W}
Type: Creature — Dragon
Power / toughness: 5 / 5
Set: Modern Horizons 2 #445 (rare)
Price: $0.30 USD

Flying
Plainscycling {2} ({2}, Discard this card: Search your library for a Plains card, reveal it, put it into your hand, then shuffle.)
Eternalize {2}{W}{W} ({2}{W}{W}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Dragon with no mana cost. Eternalize only as a sorcery.)

Timeless Dragon has 7 printings, first in Modern Horizons 2 (2021). EDHREC ranks it #9,186 among Commander cards. It appears most in Temmet, Naktamun's Will decks (1,387 on EDHREC). 1 public deck on TCG runs it. It has 6 official rulings.

Legality

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

Public decks that run Timeless Dragon

Eternal Might - Aetherdrift Commander, led by Temmet, Naktamun's Will

Commanders that run Timeless Dragon most

Deck counts from EDHREC.

Often played with Timeless Dragon

Cards that show up in the same decks on EDHREC.

Rulings

2021-06-18: If a creature card with eternalize is put into your graveyard during your main phase, you'll have priority immediately afterward. You can activate its eternalize ability before any player can try to exile it, if it's legal for you to do so.
2021-06-18: The token is a Zombie in addition to its other types and is black instead of its other colors. Its base power and toughness are 4/4. It has no mana cost, and thus its mana value is 0. These are copiable values of the token that other effects may copy.
2021-06-18: Unlike the normal cycling ability, typecycling doesn't allow you to draw a card. Rather, it lets you search your library for a card with the type or types indicated by the ability name. For example, a card with basic landcycling lets you search for a basic land card, and a card with Wizardcycling lets you search for a Wizard card.
2021-06-18: The token copies exactly what was printed on the original card and nothing else, except the characteristics specifically modified by eternalize. It doesn't copy any information about the object the card was before it was put into your graveyard.
2021-06-18: Typecycling is a form of cycling. Any ability that triggers on a card being cycled also triggers on a card being typecycled. Any ability that stops a cycling ability from being activated also stops a typecycling ability from being activated.
2021-06-18: Once you've activated an eternalize ability, the card is immediately exiled. Opponents can't try to stop the ability by exiling the card.