Ad Nauseam

Reveal the top card of your library and put that card into your hand. You lose life equal to its mana value. You may repeat this process any number of times.

Zendikar Resurgent

Whenever you tap a land for mana, add one mana of any type that land produced. (The types of mana are white, blue, black, red, green, and colorless.)
Whenever you cast a creature spell, draw a card.

Jawbone Skulkin

{2}: Target red creature gains haste until end of turn.

Stonecoil Serpent

Reach, trample, protection from multicolored
This creature enters with X +1/+1 counters on it.

Lightning-Core Excavator

{5}, {T}, Sacrifice this creature: It deals 3 damage to any target.

Inquisitive Puppet

When this creature enters, scry 1.
Exile this creature: Create a 1/1 white Human creature token.

Jhoira's Familiar

Flying
Historic spells you cast cost {1} less to cast. (Artifacts, legendaries, and Sagas are historic.)

Walking Ballista

This creature enters with X +1/+1 counters on it.
{4}: Put a +1/+1 counter on this creature.
Remove a +1/+1 counter from this creature: It deals 1 damage to any target.

Phyrexian Walker

Soldevi Sentry

{1}: Choose target opponent. Regenerate this creature. When it regenerates this way, that player may draw a card.

Bonded Construct

Hangarback Walker

This creature enters with X +1/+1 counters on it.
When this creature dies, create a 1/1 colorless Thopter artifact creature token with flying for each +1/+1 counter on this creature.
{1}, {T}: Put a +1/+1 counter on this creature.

Arcbound Stinger

Flying
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Frogmite

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)

Consulate Skygate

Defender
Reach (This creature can block creatures with flying.)

Endless One

This creature enters with X +1/+1 counters on it.

Straw Golem

When an opponent casts a creature spell, sacrifice this creature.

Umori, the Collector

Companion — Each nonland card in your starting deck shares a card type. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.)
As Umori enters, choose a card type.
Spells you cast of the chosen type cost {1} less to cast.

Ugin's Conjurant

This creature enters with X +1/+1 counters on it.
If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from this creature.

Heartless Summoning

Creature spells you cast cost {2} less to cast.
Creatures you control get -1/-1.

Nylea, Keen-Eyed

Indestructible
As long as your devotion to green is less than five, Nylea isn't a creature.
Creature spells you cast cost {1} less to cast.
{2}{G}: Reveal the top card of your library. If it's a creature card, put it into your hand. Otherwise, you may put it into your graveyard.

Oketra's Monument

White creature spells you cast cost {1} less to cast.
Whenever you cast a creature spell, create a 1/1 white Warrior creature token with vigilance.

Augmenting Automaton

{1}{B}: This creature gets +1/+1 until end of turn.

Beast Whisperer

Whenever you cast a creature spell, draw a card.

Memnite

Foundry Inspector

Artifact spells you cast cost {1} less to cast.

Jousting Dummy

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

Hope of Ghirapur

Flying
Sacrifice Hope of Ghirapur: Until your next turn, target player who was dealt combat damage by Hope of Ghirapur this turn can't cast noncreature spells.

Keeper of the Lens

You may look at face-down creatures you don't control any time.

Hedron Crawler

{T}: Add {C}. ({C} represents colorless mana.)

Myr Moonvessel

Brass Gnat

Flying
This creature doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {1}. If you do, untap this creature.

Phyrexian Marauder

This creature enters with X +1/+1 counters on it.
This creature can't block.
This creature can't attack unless you pay {1} for each +1/+1 counter on it.

Primordial Sage

Whenever you cast a creature spell, you may draw a card.

Bronze Sable

Metallic Sliver

Shifting Wall

Defender (This creature can't attack.)
This creature enters with X +1/+1 counters on it.

Copper Myr

Myr Mindservant

Gingerbrute

Haste (This creature can attack and {T} as soon as it comes under your control.)
{1}: This creature can't be blocked this turn except by creatures with haste.
{2}, {T}, Sacrifice this creature: You gain 3 life.

Signal Pest

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
This creature can't be blocked except by creatures with flying or reach.

Sparring Construct

When this creature dies, put a +1/+1 counter on target creature you control.

Hovermyr

Field Creeper

Razorgrass Screen

Defender (This creature can't attack.)
This creature blocks each combat if able.

Helm of Awakening

Arcbound Worker

Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Glimpse of Nature

Whenever you cast a creature spell this turn, draw a card.

Eager Construct

When this creature enters, each player may scry 1. (To scry 1, look at the top card of your library, then you may put that card on the bottom.)

Locthwain Gargoyle

{4}: This creature gets +2/+0 and gains flying until end of turn.

Myr Enforcer

Arcbound Slith

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Vector Asp

{B}: This creature gains infect until end of turn. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Ornithopter

Cryptic Trilobite

This creature enters with X +1/+1 counters on it.
Remove a +1/+1 counter from this creature: Add {C}{C}. Spend this mana only to activate abilities.
{1}, {T}: Put a +1/+1 counter on this creature.

Heap Doll

Sacrifice this creature: Exile target card from a graveyard.

Centaur Omenreader

As long as this creature is tapped, creature spells you cast cost {2} less to cast.