It is, however, not an easy card to play correctly, as everyone who has watched control master Guillaume Wafo-Tapa before, will know
In that deck, Bloodghast can enable absurd amounts of card draw and ramp if it's combined with my commander and a way to untap her like Thornbite Staff
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They still have to follow your commanders color identity, of course, just like the rest of the 99
The battle's protector doesn't control it, but they can block creatures that are attacking the battle just like they can block attacks on planeswalkers they control
Pros: Cons: Serra Paragon or another relevant angel would seem better