Combine Doomsday with Doctor Doom to win the game in a single masterstroke.

Medium monstrosity (shapechanger), Challenge 3
Armor class 14, Hit Points 52
Speed 30 ft.
Attacks Shapechanger, Slam, Read Thoughts
STR 11 (+0) DEX 18 (+4) CON 14 (+2)
INT 11 (+0) WIS 12 (+1) CHA 14 (+2)

You can mark this card to represent a double-faced card in your library or hand.

Cloistered Youth
Thraben Sentry
Civilized Scholar
Delver of Secrets
Ludevic's Test Subject
Bloodline Keeper
Screeching Bat
Hanweir Watchkeep
Instigator Gang
Kruin Outlaw
Reckless Waif
Tormented Pariah
Village Ironsmith
Daybreak Ranger
Garruk Relentless
Gatstaf Shepherd
Grizzled Outcasts
Mayor of Avabruck
Ulvenwald Mystics
Villagers of Estwald

You can mark this card to represent a double-faced card in your library or hand.

Loyal Cathar
Soul Seizer
Chosen of Markov
Ravenous Demon
Afflicted Deserter
Hinterland Hermit
Mondronen Shaman
Lambholt Elder
Scorned Villager
Wolfbitten Captive
Huntmaster of the Fells
Chalice of Life
Elbrus, the Binding Blade

You can mark this card to represent a double-faced Planeswalker card in your library or hand.

Kytheon, Hero of Akros
Jace, Vryn's Prodigy
Liliana, Heretical Healer
Chandra, Fire of Kaladesh
Nissa, Vastwood Seer

You can mark this card to represent a meld or double-faced Planeswalker card in your library or hand.

Bruna, the Fading Light
Extricator of Sin
Gisela, the Broken Blade
Lone Rider
Curious Homunculus
Docent of Perfection
Grizzled Angler
Graf Rats
Midnight Scavengers
Voldaren Pariah
Conduit of Storms
Hanweir Garrison
Smoldering Werewolf
Vildin-Pack Outcast
Kessig Prowler
Shrill Howler
Tangleclaw Werewolf
Ulvenwald Captive
Ulrich of the Krallenhorde
Cryptolith Fragment
Hanweir Battlements

You can mark this card to represent a double-faced card in your library or hand.

Legion's Landing
Search for Azcanta
Arguel's Blood Fast
Vance's Blasting Cannons
Growing Rites of Itlimoc
Conqueror's Galleon
Dowsing Dagger
Primal Amulet
Thaumatic Compass
Treasure Map

You can mark this card to represent a double-faced card in your library or hand.

Hadana's Climb
Journey to Eternity
Path of Mettle
Profane Procession
Storm the Vault
Azor's Gateway
Golden Guardian

You can mark this card to represent a double-faced card card in your library or hand.

Avacynian Missionaries
Pious Evangel
Town Gossipmonger
Aberrant Researcher
Daring Sleuth
Uninvited Geist
Accursed Witch
Heir of Falkenrath
Kindly Stranger
Breakneck Rider
Convicted Killer
Gatstaf Arsonists
Kessig Forgemaster
Skin Invasion
Village Messenger
Autumnal Gloom
Duskwatch Recruiter
Hermit of the Natterknolls
Hinterland Logger
Lambholt Pacifist
Solitary Hunter
Harvest Hand
Neglected Heirloom
Thraben Gargoyle

You can mark this card to represent a double-faced Planeswalker card in your library or hand.

Archangel Avacyn
Hanweir Militia Captain
Startled Awake
Thing in the Ice
Elusive Tormentor
Geier Reach Bandit
Sage of Ancient Lore
Arlinn Kord
Westvale Abbey

Defender
When this creature dies, create a 2/2 red Dragon creature token with flying and ": This creature gets +1/+0 until end of turn."

Gargantuan Dragon, Challenge 17
Armor class 20, Hit Points 341
Speed 20 ft., swim 40 ft.
Attacks Bite, Claw, Tail, Steam Breath
STR 25 (+7) DEX 10 (+0) CON 20 (+5)
INT 10 (+0) WIS 12 (+1) CHA 12 (+1)

Large monstrosity, Challenge 6
Armor Class 19, Hit Points 123
Speed 30 ft., climb 30 ft.
Attacks Innate Spellcasting, Spider Climb, Bite
STR 16 (+3) DEX 16 (+3) CON 18 (+4)
INT 13 (+1) WIS 14 (+2) CHA 12 (+1)

Deathtouch
When this creature leaves the battlefield, each opponent loses 2 life and you gain 2 life.

Flying
This token can block only creatures with flying.

Yawning Portal — You gain 1 life. (=> Dungeon Level)

Dungeon Level — Scry 1. (=> Goblin Bazaar or Twisted Caverns)

Goblin Bazaar — Create a Treasure token. (=> Lost Level)

Twisted Caverns — Target creature can't attack until your next turn. (=> Lost Level)

Lost Level — Scry 2. (=> Runestone Caverns or Muiral's Graveyard)

Runestone Caverns — Exile the top two cards of your library. You may play them. (=> Deep Mines)

Muiral's Graveyard — Create two 1/1 black Skeleton creature tokens. (=> Deep Mines)

Deep Mines — Scry 3. (=> Mad Wizard's Lair)

Mad Wizard's Lair — Draw three cards and reveal them. You may cast one of them without paying its mana cost.

Go wide with legendary allies

High-power brawlers

Weaponize your lands

Wield lands in combat

Large Aberration, Challenge 14
Armor class 10, Hit Points 210
Speed 5 ft., swim 10 ft.
Attacks Innate Spellcasting (Psionics), Tentacle, Mind Blasts, Psychic Link, Sense Thoughts
STR 15 (+2) DEX 10 (+0) CON 20 (+5)
INT 21 (+5) WIS 19 (+4) CHA 24 (+7)