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Legendary Creature Dragon4/4 Flying Whenever Fang attacks, another target legendary creature you control gets +X/+0 until end of turn, where X is Fang's power

We can't identify a ton of new cards that would make Rot Hulk loads better than it was before (though Geralf the Fleshwright seems like a fun one from MTG Thunder Junction), so it's likely the overall popularity of Wilhelt is increasing, rather than the proportion of new Wilhelt decks containing Rot Hulk going up

If it has at least one target, and all its targets are illegal when it tries to resolve, then it wont resolve and none of its effects will happen