What is doomcaliber knight

A Yu-Gi-Oh TCG card that reads as follows:

Doomcaliber Knight
Attrib: Dark
Type: Fiend/Effect
Level:4
Atk: 1900
Def: 1800
This card cannot be Special Summoned. When an Effect Monster's effect is activated, you must Tribute this card. Negate that effect's activation, and destroy the monster.

At this time this card is only available by either taking a high place in the Shonen Jump Championship tournaments, or by getting it randomly in the 5Ds Turbo Pack only available in Europe.