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Ogre Marauder got changed to grant itslef "Ogre Marauder is unblockable" to make it clear when the defending player gets to sacrifice. But like Shrouded Serpent , we can reverse the condition and the effect instead of granting an ability:

• Whenever Ogre Marauder attacks, defending player may sacrifice a creature, if he or she doesn't, Ogre Marauder is unblockable this turn.

This would make it impervious to " Humble " effects, as its text suggests. (Until people's wish to keyword "unblockable" becomes a reality  )

I know, right? 
Initially I didn't have an example, so it was a nice surprise to find one with that very template, and not to mention that functions so similarly to Ogre Marauder .