Craterhoof Behemoth is the gold standard, but pretty much any of these effects are good
As some fun trivia, the Spanish translation for both the Fear card and ability is inspirar temor, which translates back as inspire fear. This is one of the few instances where I think the translation makes more sense and works better than the original
You'll draw two cards, even though the player doesn't gain control of Humble Defector
In decks with Skullclamp, Tempered Steel and such things the value of this goes up
As long as you have a full party, if an ability of a creature you control triggers, that ability triggers an additional time.
If you have a card in your hand with an activated ability, you drag it onto the battlefield as though you were going to cast it