Aboleth Spawn Abomination Abomination of Gudul Abomination of Llanowar Abyssal Gatekeeper Abyssal Gorestalker Abyssal Horror Abyssal Nocturnus Advanced Stitchwing Ahriman Ancient Cellarspawn Angel of Suffering Appendage Amalgam Arcbound Fiend Armaggon, Future Shark Arvinox, the Mind Flail Ashiok's Reaper Ashiok's Skulker Atraxa, Praetors' Voice Awoken Horror Balefire Liege Banehound Bedlam Reveler Blistergrub Bloodcurdler Boneshard Slasher Boneyard Lurker Braids, Arisen Nightmare Brainstealer Dragon Braska's Final Aeon Brokkos, Apex of Forever Bruna, the Fading Light Cabal Therapist Canker Abomination Captain N'ghathrod Carnival Carnivore Carnival Hellsteed Carrion Locust Cateran Brute Cateran Enforcer Cateran Overlord Cateran Slaver Cavern Whisperer Chained Throatseeker Chasm Skulker Childhood Horror Chittering Harvester Chittering Host Chupacabra Echo Clammy Prowler Cleaver Skaab Comet Crawler Conduit of Storms Consuming Aberration Core Prowler Corrupted Harvester Cosmic Horror Crawling Chorus Creakwood Liege Creeping Inn Cruel Somnophage Cruel Witness Crypt Lurker Cryptborn Horror Culvert Ambusher Cursed Monstrosity Cursed Wombat Dark Hatchling Dauthi Horror Deathbonnet Hulk Deathbringer Liege

The set itself contains a whopping 1,670 reprints from across the game's history (see below for the full list), plus 121 copies of something new and surprisingR&D Playtest cards you won't find anywhere outside of Mystery Booster: Convention Edition
Add in ways to buff it up and you can have a pretty good way to take out opponents with commander damage
Its a simple matter where each card does damage to each other according to their strength and can absorb damage equal to their willpower
Echoing Deeps Land Cave You may have Echoing Deeps enter the battlefield tapped as a copy of any land card in a graveyard, except it's a Cave in addition to its other types