Sinister Yorishiro – (Structure Lair of Darkness) – (SR06-EN040) – (Common)

Each turn, 1 Level 5 or higher Fiend monster you Normal Summon can be Summoned without Tributing. If exactly 1 Normal Summoned/Set Level 5 or higher Fiend monster (and no other cards) would be destroyed, you can send this card to the GY instead.