Sample GG-3883 card

This card is used to Ritual Summon "Gordan Freeman". You must also offer monsters whose total Level Stars equal 7 or more as a Tribute from the field or your hand. If "Test Chamber C/33a" is in play, you only need to offer 4 Level Stars instead of 7.

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The fourth card in the Half Life set is the ritual card for Gordan Freeman. Pretty cut and dried.