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Description
yugioh.wikia.com/wiki/Pyrorex_…

effect:

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by having exactly 5 FIRE monsters in your Graveyard, and cannot be Special Summoned by other ways. When this card is Special Summoned: You can target 1 monster your opponent controls; destroy it, and if you do, both players take damage equal to half the original ATK of the destroyed monster. You can only use this effect of "Pyrorex the Elemental Lord" once per turn. If this card leaves the field, skip the Battle Phase of your next turn.

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This card's name is a portmanteau of "pyro" and "rex", the latter referring to a Tyrannosaurus rex .
It is also possibly a pun on Pyrodex , the first black powder substitute.
Like the other "Elemental Lord " cards, this monster's given name is in a unique Western language, in this case Latin (pyro is Greek for fire, while "rex" is Latin for king).

Description
yugioh.wikia.com/wiki/Pyrorex_…

effect:

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by having exactly 5 FIRE monsters in your Graveyard, and cannot be Special Summoned by other ways. When this card is Special Summoned: You can target 1 monster your opponent controls; destroy it, and if you do, both players take damage equal to half the original ATK of the destroyed monster. You can only use this effect of "Pyrorex the Elemental Lord" once per turn. If this card leaves the field, skip the Battle Phase of your next turn.

___________________

This card's name is a portmanteau of "pyro" and "rex", the latter referring to a Tyrannosaurus rex .
It is also possibly a pun on Pyrodex , the first black powder substitute.
Like the other "Elemental Lord " cards, this monster's given name is in a unique Western language, in this case Latin (pyro is Greek for fire, while "rex" is Latin for king).