Once per turn: You can make this card's ATK become double its original ATK, until the End Phase. During the End Phase, if this effect of this card was used: Destroy this card.
Possible replacement for Gravekeeper Vassal? SPttT can target, get an increase from Union Attack then double during the attack step, would this currently work for a Vampire Farm Deck, maybe using Vampire Vamp?
There are so, so many things wrong with what you just said. Plague Wolf's effect is an Ignition effect, so can only be used in your Main Phase, Union Attack would prevent it actually inflicting any Battle Damage to the opponent (hence why Vassal's used in the first place), and Union Attack doesn't increase its original ATK, so even if you could do what you're saying, it would still end up at 2000.
Umm, '... double its original atk...' the wolf, '... your opp takes no battle damage ...' union att, the hell v vamp will interact with this card ... it's another trash dude ...
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