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2 Left Leg Of The Forbidden One $299.95 Getting Your Friends Into Yu-Gi-Oh

Esper Sentinel pips both Archivist of Oghma and Deep Gnome Terramancer to a spot on this list, and its because the latter two cards both require opponents making deckbuilding decisions we cant control

Lady Labrynth of the Silver Castle X DARK Level 8 [ Fiend / Effect ] ATK 3000 DEF 2900 While you control a Set card, your opponent cannot target this card with card effects, also it cannot be destroyed by your opponent's card effects

With the emphasis on, Me. These are just my personal favorites

It is a Water card illustrated by Sekio

Getting plenty of play will probably have boosted its market value at least a little, but ultimately it's the low supply, inherent to any prize card, that has made Diablosis so expensive