I'm using piranha army with union attack and ojamas, when I attack directly no damage is dealt
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anoymous
Using Union Attack does not deal battle damage to your opponent. You should use Gravekeeper's Vassal as it is treated as effect damage instead.
Next time, please read the cards carefully.
anoymous
Yeah, use Gravekeepers Vassal. It's an early lvl up reward card from Ishizu.
anoymous
Read the card pls and use ya brain
anoymous
Because when you use union attack, the monster you target cannot deal battle damage.
This is the reason why is used on the vassal who deals effect damage instead.