Yubel - The Ultimate Nightmare (PTDN-EN008) - Phantom Darkness Unlimited Number_DB2-EN012 You must also offer monsters

You must also offer monsters whose total Level Stars equal 4 or more as a Tribute from the field or your hand

you can Special Summon 1 Dragon-Type monster from your hand

you can Special Summon 1 Level 4 DARK monster from your Graveyard

you can change the battle position of 1 face-up monster your opponent controls

then Special Summon that target

Yubel - The Ultimate Nightmare (PTDN-EN008) - Phantom Darkness Unlimited Number_DB2-EN012 You must also offer monstersTypeFiend Effect Monster AttributeDark Card TextThis card cannot be Normal Summoned or Set. This card cannot be Special Summoned except with the effect of "Yubel Terror Incarnate". This card cannot be destroyed by battle. You take no Battle Damage from battles involving this card. If this face up Attack Position card battles an opponent's monster, inflict damage equal to its ATK to your opponent and destroy that monster at the end of the Damage Step.