Golgari anti-red

Why is this anti-red beyond gaining some life, something green occasionally does and black can do via drain? Blowing up any permanent seems like an ability that would hate on all colors equally (though I could see red and blue being equally more disadvantaged since they might only have lands as choice targets).

Obviously life gain is to prolong oneself against red's fast creatures and burn. This creatures helps on both fronts. If it dies in combat (chump block) or from their burn, that slows down red player's strategy.

The sacrifice is crucial to provide an instant outlet to trigger the other ability in emergencies. That is, to get back some life as a last resort. What that effect does is not important, as long it falls within the pie. In actuality, this particular one is to test the boundary of getting Vindicate. It also paints itself as a threat that red may want to get rid of ASAP, but in doing so is not without risk for the red player.