Centaur

Dragon

Goblin

Creatures you control attack each combat if able.

Fish

Manifest

(You can cover a face-down manifested creature with this reminder card.
A manifested creature card can be turned face up any time for its mana cost. A face-down card can also be turned face up for its morph cost.)

Inkling

Angel

Boar

Treefolk

Spirit

Phyrexian

Poison Counter

(A player with ten or more poison counters loses the game.)

Frog Lizard

Dinosaur

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Elf Warrior

Detective

Bird

Robot

Garruk, Apex Predator Emblem

Whenever a creature attacks you, it gets +5/+5 and gains trample until end of turn.

Goblin Construct

This creature can't block.
At the beginning of your upkeep, this creature deals 1 damage to you.

Giant Teddy Bear

Pirate

Snake

Human

Warrior

Eldrazi Spawn

Elemental

{1}, {T}, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)

Treasure

{T}, Sacrifice this token: Add one mana of any color.

Skeleton

Menace (This creature can't be blocked except by two or more creatures.)

Illusion

Sheep

Ob Nixilis Reignited Emblem

Whenever a player draws a card, you lose 2 life.

Bear

Faerie

Lander

{2}, {T}, Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Soldier

Fractal

Elephant

Powerstone

{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.

Walker

Beast

The Monarch

At the beginning of your end step, draw a card.
Whenever a creature deals combat damage to you, its controller becomes the monarch.

Chandra, Roaring Flame Emblem

At the beginning of your upkeep, this emblem deals 3 damage to you.

Radiation

At the beginning of your precombat main phase, if you have any rad counters, mill that many cards. For each nonland card milled this way, you lose 1 life and a rad counter.

Rat Rogue

Squirrel

Plant

Knight

Morph

(You can cover a face-down creature with this reminder card.
A card with morph can be turned face up any time for its morph cost.)

Saproling

Clue

Shapeshifter

Lightning Rager

Trample, haste
At the beginning of the end step, sacrifice this creature.

Samurai

Horror

Goat

Survivor

The Initiative

Whenever one or more creatures a player controls deal combat damage to you, that player takes the initiative.
Whenever you take the initiative and at the beginning of your upkeep, venture into Undercity. (If you're in a dungeon, advance to the next room. If you're not, enter Undercity. You can take the initiative even if you already have it.)

Undercity

You can't enter this dungeon unless you "venture into Undercity."
Secret Entrance — Search your library for a basic land card, reveal it, put it into your hand, then shuffle. (Leads to: Forge, Lost Well)
Forge — Put two +1/+1 counters on target creature. (Leads to: Trap!, Arena)
Lost Well — Scry 2. (Leads to: Arena, Stash)
Trap! — Target player loses 5 life. (Leads to: Archives)
Arena — Goad target creature. (Leads to: Archives, Catacombs)
Stash — Create a Treasure token. (Leads to: Catacombs)
Archives — Draw a card. (Leads to: Throne of the Dead Three)
Catacombs — Create a 4/1 black Skeleton creature token with menace. (Leads to: Throne of the Dead Three)
Throne of the Dead Three — Reveal the top ten cards of your library. Put a creature card from among them onto the battlefield with three +1/+1 counters on it. It gains hexproof until your next turn. Then shuffle.

Undercity // The Initiative

Sphinx

Chandra, Awakened Inferno Emblem

At the beginning of your upkeep, this emblem deals 1 damage to you.

A Mysterious Creature

You can cover a face-down creature with this reminder card. A face-down creature that was cloaked or cast with disguise has ward {2}. (Whenever that creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)

Mutant

Zombie

Blood

{1}, {T}, Discard a card, Sacrifice this token: Draw a card.

Food

{2}, {T}, Sacrifice this token: You gain 3 life.

Salamander Warrior

Junk

{T}, Sacrifice this artifact: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.

This creature can't block.
Creatures you control attack each combat if able.

Octopus

Night

As it becomes night, transform all daybound permanents.
Permanents enter the battlefield nightbound.
If a player casts at least two spells during their own turn, it becomes day next turn.

(If it becomes day or night or if a daybound permanent enters the battlefield, track day/night for the rest of the game.)
As it becomes day, transform all nightbound permanents.
If a player casts no spells during their own turn, it becomes night next turn.