Primaris Eliminator
The choice between the two fired rounds is really a choice between a scalpel and a scattergun, and the second option is what earns the slot. Single-target removal on an enters-the-battlefield trigger is common enough; black has priced that effect at a fraction of five mana for decades. What makes the Hyperfrag Round mode distinct is that it aims at a player rather than a permanent: every creature one opponent controls takes -2/-2 at once, which turns a body that reads like an expensive removal spell into a one-sided board sweep against go-wide strategies. Tokens, mana dorks, aristocrat fodder, weenie swarms: all of it dies to state-based action in a single trigger, and because the mode drops toughness to zero rather than destroying anything, it slips under indestructible and regeneration in a way targeted destruction does not. The two modes are deliberately non-overlapping in the problems they solve, so the card asks the pilot to read the board before it resolves: is the threat one large creature the Executioner Round can answer cleanly, or a field of small ones the toughness reduction unravels. That the trigger is stapled to a 3/2 that stays on the battlefield afterward, rather than to a sorcery, is the quiet part; the removal is the entry fee, and the recurring blocker is what you keep.

