Dragon's Hoard

Whenever a Dragon you control enters, put a gold counter on this artifact.
{T}, Remove a gold counter from this artifact: Draw a card.
{T}: Add one mana of any color.

Thassa, God of the Sea

Indestructible
As long as your devotion to blue is less than five, Thassa isn't a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)
At the beginning of your upkeep, scry 1.
{1}{U}: Target creature you control can't be blocked this turn.

Command Tower

Tower Winder

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

Clue

Tireless Tracker

Landfall — Whenever a land you control enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on this creature.

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Merfolk of the Pearl Trident

Lord of the Pit

Flying, trample
At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you.

Shivan Dragon

Sarkhan, Wanderer to Shiv

Flying
{R}: This creature gets +1/+0 until end of turn.

Giant Growth

Target creature gets +3/+3 until end of turn.

Maro

Maro's power and toughness are each equal to the number of cards in your hand.

Ephara, God of the Polis

Indestructible
As long as your devotion to white and blue is less than seven, Ephara isn't a creature.
At the beginning of each upkeep, if you had another creature enter the battlefield under your control last turn, draw a card.

Thought-Knot Seer

({C} represents colorless mana.)
When this creature enters, target opponent reveals their hand. You choose a nonland card from it and exile that card.
When this creature leaves the battlefield, target opponent draws a card.

Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Innistrad Checklist

Delver of Secrets // Insectile Aberration

Insects always occupied a special place in the wizard's heart.

Delver of Secrets

At the beginning of your upkeep, look at the top card of your library. You may reveal that card. If an instant or sorcery card is revealed this way, transform this creature.

Now insects occupy a special place in his lungs, intestines, liver, kidneys, eyeballs...

Insectile Aberration

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Secret Lair Drop