The Heron Moon

{T}: Add {C}.
{1}, {T}: Exile the bottom card of target opponent's library.
Whenever one or more cards an opponent owns are put into exile, put a release counter on The Heron Moon. Then if it has thirteen or more release counters on it, sacrifice it and create a copy of Emrakul, the Promised End. Cast it without paying its mana cost.

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Command Tower

Worst Fears

You control target player during that player's next turn. Exile Worst Fears. (You see all cards that player could see and make all decisions for the player.)

Mind Twist

Target player discards X cards at random.

Glade of the Pump Spells

(You have to pay {2}{G} to play this land as your land drop. It's green.)
When Glade of the Pump Spells enters the battlefield, up to one target creature gets +2/+2 and gains trample until end of turn.
{T}: Add {G}{G}.

Path to Exile

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Goblin Charbelcher

{3}, {T}: Reveal cards from the top of your library until you reveal a land card. Goblin Charbelcher deals damage equal to the number of nonland cards revealed this way to any target. If the revealed land card was a Mountain, Goblin Charbelcher deals double that damage instead. Put the revealed cards on the bottom of your library in any order.

Naturalize 2

Destroy target artifact, enchantment, emblem, or gameplay tracker. (Trackers include play aids such as dungeons, city's blessing, and monarch. When you destroy it, the associated object or designation is removed from the game.)

Chea, Friend to Maybe Too Many

Familiar spells you cast have flash. (Bats, Birds, Cats, Dragons, Faeries, Foxes, Frogs, Imps, Lizards, and Spiders are familiars, as well as any creature with "Familiar" in its name.)
{T}: Add X {G} and each opponent loses X life, where X is the number of familiars you control.

Bolas's Citadel

You may look at the top card of your library any time.
You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost.
{T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.

Deafening Silence

Each player can't cast more than one noncreature spell each turn.

Call from the Grave

Put a random creature from a random graveyard into play under your control. Call from the Grave deals to you an amount of damage equal to that creature's casting cost.

Once Upon a Time

If this spell is the first spell you've cast this game, you may cast it without paying its mana cost.
Look at the top five cards of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Seeker of Skybreak

Ghost Quarter

{T}: Add {C}.
{T}, Sacrifice Ghost Quarter: Destroy target land. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.

Sol Ring

Penumbra Umbra

Enchant creature you control
When Penumbra Umbra is put into a graveyard from the battlefield, create a token that's a copy of enchanted creature, except the token is black.
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)

Leyline of the Void

If Leyline of the Void is in your opening hand, you may begin the game with it on the battlefield.
If a card would be put into an opponent's graveyard from anywhere, exile it instead.