Terminal Criticism destroys Eddymurk Crab and any other blue or red creature outright while gaining you life against their aggressive clock, making it efficient removal here. Qarsi Revenant's deathtouch and lifelink stabilizes the race against their burn and evasive threats like Slickshot Show-Off. Mosswood Dreadknight trades down against Burst Lightning and their efficient creatures, so it comes out. Garruk is slightly too slow against a low-curve aggro deck, so one copy is trimmed for more immediate, race-relevant answers.