Umm Isn't it written on the card?
If
this card was Special Summoned by the effect of a "Gladiator Beast"
monster, its original ATK is 2100. At the end of the Battle Phase, if
this card attacked or was attacked, you can return it to the Deck to
Special Summon 1 "Gladiator Beast" monster from your Deck, except
"Gladiator Beast Laquari".