If you control a face-up "Gladiator Beast" monster, you can Special Summon this card (from your hand). You can Tribute this card to target 1 face-up "Gladiator Beast" monster you control; shuffle that target into the Deck, then Special Summon 1 "Gladiator Beast" from your Deck, and treat it as if it was Special Summoned by the effect of a "Gladiator Beast" monster.
Essentially activates a Gladiator Beast’s tag effect.
Tributes itself to use effect.
Useless on its own.
Test Tiger can Special Summon another copy of the Gladiator Beast monster you returned to your deck.
Test Tiger is good for searching Gladiator Beasts from your deck and triggering their effects. Generally the best ones to summon are the ones with removal effects or those that help you make Fusion Summons.