RUNE AGE 擴充OATH AND ANVIL - 桌遊

想請問一張中立怪的用法

FLESH MOULDER
它的能力是Discard this unit to play a unit from youur hand into this combat.
Do not trigger that unit's WHEN PLAYED abilities.

這張功能到底是作什麼用?
不是直接play一張兵就好了嗎,為什麼還要棄掉這張再叫出來,還沒有能力


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