Number 17: Leviathan Dragon [CT08-EN001] Secret Rare Tuner/Effect Monster follow its card text as

follow its card text as if you had used it yourself

When an opponent's monster declares an attack: Toss a coin and if the result is heads

You can only use this effect of "Raidraptor - Mimicry Lanius" once per turn

or the effects of cards

When this card is sent from the field to the Graveyard: You can target 1 "Guardian Eatos" you control

Number 17: Leviathan Dragon [CT08-EN001] Secret Rare Tuner/Effect Monster follow its card text asSet: 2011 Collectors Tins Card type: Xyz Effect Monster Rarity: Secret Rare Attack: 2000 Defense: 0 2 Level 3 monsters Once per turn: You can detach 1 Xyz Material from this card, this card gains 500 ATK. If this card has no Xyz Materials, it cannot attack your opponent directly.