Gladiator Beast Retiari

“When this card is Special Summoned by the effect of a "Gladiator Beast" monster, you can remove from play 1 card from your opponent's Graveyard. 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 Retiari".”