Litmus Doom Ritual [BLRR-EN014] Ultra Rare

This card is used to Ritual Summon "Litmus Doom Swordsman". You must also Tribute monsters from your hand or field whose total Levels equal 8 or more. If this card is in your GY: You can target 1 "Swordsman Of Doom Lithmus" in your GY; shuffle both it and this card from your GY into your Deck then draw 1 card. You can oly use this effect of "Litmus Doom Ritual" once per turn.