What is a Stardust Dragon?

Answer 1

"Stardust Dragon" is a Yu-Gi-Oh! card first released in the US in the booster packThe Duelist Genesis on September 2, 2008. It is a WIND-Attribute, Dragon-Type Synchro Monster with 8 stars, 2500 ATK and 2000 DEF.

"Stardust Dragon" is a Synchro Monster so in order to Special Summon it from the Extra Deck, you meet a few conditions beforehand. On your field must exist at least one Tuner monster. In addition to that Tuner, there must be additional face-up non-Tuner Monsters whose stars plus the Tuner's stars equals the level of the Synchro Monster; in this case eight for "Stardust Dragon". Send those Monsters to the Graveyard and you can Synchro Summon "Stardust Dragon".

The effect of "Stardust Dragon" reads:

You can Tribute this card to negate the activation of a Spell Card, Trap Card, or Effect Monster's effect that destroys a card(s) on the field, and destroy that card. If you negate an effect this way, you can Special Summon this card from your Graveyard during the End Phase.

In the Yu-Gi-Oh! 5D's anime, this is Yusei Fudo's signature card and one of the Five Dragons of the Signers.