Mono-Red Aggro is racing you with burn like Burst Lightning and Lightning Strike plus haste dragons like Nova Hellkite, so Dawn's Truce protects your life total and board from a critical burst of damage. Get Lost can answer a resolved Smaug the Magnificent or Magmatic Hellkite before it takes over. The extra Voice of Victory adds a resilient blocker that also shuts down their ability to interact during your turn. Requiting Hex's blight mode puts -1/-1 counters on your own creatures when you need blockers against this clock, and Emptiness's evoke mode is weaker than dedicated removal against their bigger dragon threats, so both are trimmed for more direct answers and life-total protection.