Outland Liberator can destroy Goblin Bombardment or Blood Moon, both of which are enchantments. Blood Moon is very painful against our nonbasic-heavy manabase, and Goblin Bombardment can pick off our small mana creatures. Endurance flashes in as a 3/4 reach blocker against Ocelot Pride and Ajani's Cat token swarms, and its enter trigger can put a graveyard on the bottom of the library, which denies value from cards like Seasoned Pyromancer's graveyard ability. Boros Energy is an aggressive go-wide deck, so defensive bodies and targeted artifact/enchantment removal are higher priority than our slower top-end finishers.