Instant card draw in either Boros color is pretty hard to come by, even if its only one net card for four mana
The best replacement for Impact Tremors turned out to be Zulaport Cutthroat, but it does the extra damage on their way off the board instead of on impact
Plague Reaver is comparably good as the standalone Reanimator threat and discard outlet, and while it is kind of garbage in an aggressive deck, I could see it playing well in a controlling one
I would have to have an aggressive deck using a lot of effects that enhance creatures, or perhaps require raid triggers or crewing before digging this out these days
If youve got that free artifact sac outlet, You can pay one mana to Nuka-Cola Vending Machine, get two artifact ETBs, two artifact LTBs, and your mana back