Brother Voodoo can give you 2 thwart and a block for 3-4 ER. Most protection decks seem to run more than 10 events nowadays, so you should find one among the 5 you draw 80% of the time, reducing the ER of Brother Voodoo to 3. If you run more than 10 events that could be situational, Brother Voodoo also becomes a viable mini-tutor fetching the right event for the right situation.
To finish off, he is an Avenger, which is one the most developed trait now - you can cheat him with Avengers Tower, and Team-Building Exercise for only 1 ER, get a ready through Earth's Mightiest Heroes. It may also find a spot in a Drax deck, with Stand Together.