Chainers Torment: The final chapter creates an X/X black Nightmare Horror token where X is half your life total (rounded up), and then it deals X damage to you
Dark Sage
There are many options to the top with this archetype, your enemy will run out of life points long before they can close off all path to your most effective Heroes like Malicious Bane, usually leading to a field wipe and quick OTK
Had I downloaded this free-to-play game only to several dozen card packs I would have been satisfied, but Konami also included card battles as well
You must also Tribute monsters from your hand or field, and/or banish Fusion or Synchro Monsters from your GY, whose total Levels equal or exceed the Level of the Ritual Monster you Ritual Summon, then, if both "White Knight of Dogmatika" and "White Relic of Dogmatika" are on the field, you can look at either your Extra Deck or your opponent's, and send 1 monster from it to the GY