Malevolent Mech - Goku En (SDZW-EN002) - Structure Deck: Zombie World 1st Edition

You can Normal Summon this card without Tributing. If you do, this card is sent to the Graveyard during the End Phase if it is the only Zombie-Type monster on the field. When it it sent to the Graveyard by this effect, you take damage equal to its ATK.