What is the second rariest yu gi oh card?

Answer 1

The second rarest card is split between several, they are the Worlds first and second place prizecards. They are,

Ulevo,

King of Destruction - Xexex,

Testament of the Arcane Lords,

Chimaera the Master of Beasts,

Tyr, the Vanquishing Warlord,

Aggiba, the Malevolent Sh'nn S'yo.

Only two cards exist of each of the above, though Testament, Chimaera and Tyr received super-rare reprints at the following year's participation card.
obelisk the tormenter

Answer 2

The second rarest Yu-Gi-Oh cards are jointly the 1st/2nd place World Championship cards, only two of each exist. This includes Ulevo, King of Destruction - Xexex, and Aggiba the Malevolent Sh'nn S'yo. There are some other cards that there initially was only two of, but these have received super rare reprints as the following year's participation card.