This card is used to Ritual Summon "Garma Sword". You must also Tribute monsters whose total Levels equal 7 or more from the field or your hand.
Contract with the Abyss can be used as an alternative. However, Garma Sword Oath allows more total stars for a ritual summon while Contract with the Abyss allows only the exact number of stars of the ritual monster for the ritual summon.
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