Geyserfield Stalker

Menace (This creature can't be blocked except by two or more creatures.)
Landfall — Whenever a land you control enters, this creature gets +2/+2 until end of turn.

Retreat to Emeria

Landfall — Whenever a land you control enters, choose one —
• Create a 1/1 white Kor Ally creature token.
• Creatures you control get +1/+1 until end of turn.

Plains

Kalastria Healer

Rally — Whenever this creature or another Ally you control enters, each opponent loses 1 life and you gain 1 life.

Retreat to Hagra

Landfall — Whenever a land you control enters, choose one —
• Target creature gets +1/+0 and gains deathtouch until end of turn.
• Each opponent loses 1 life and you gain 1 life.

Unified Front

Converge — Create a 1/1 white Kor Ally creature token for each color of mana spent to cast this spell.

Sludge Crawler

Devoid (This card has no color.)
Ingest (Whenever this creature deals combat damage to a player, that player exiles the top card of their library.)
{2}: This creature gets +1/+1 until end of turn.

Felidar Cub

Sacrifice this creature: Destroy target enchantment.

Demon's Grasp

Target creature gets -5/-5 until end of turn.

Bone Splinters

As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.

Sheer Drop

Destroy target tapped creature.
Awaken 3—{5}{W} (If you cast this spell for {5}{W}, also put three +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)

Swamp

Tandem Tactics

Up to two target creatures each get +1/+2 until end of turn. You gain 2 life.

Breaker of Armies

All creatures able to block this creature do so.

Quarantine Field

This enchantment enters with X isolation counters on it.
When this enchantment enters, for each isolation counter on it, exile up to one target nonland permanent an opponent controls until this enchantment leaves the battlefield.

Nirkana Assassin

Whenever you gain life, this creature gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Goblin War Paint

Enchant creature
Enchanted creature gets +2/+2 and has haste.

Eldrazi Devastator

Seek the Wilds

Look at the top four 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 any order.

Malakir Familiar

Flying, deathtouch
Whenever you gain life, this creature gets +1/+1 until end of turn.

Kalastria Nightwatch

Whenever you gain life, this creature gains flying until end of turn.

Fortified Rampart

Sandstone Bridge

This land enters tapped.
When this land enters, target creature gets +1/+1 and gains vigilance until end of turn.
{T}: Add {W}.

Mortuary Mire

This land enters tapped.
When this land enters, you may put target creature card from your graveyard on top of your library.
{T}: Add {B}.

Carrier Thrall

When this creature dies, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add {C}."

Cliffside Lookout

{4}{W}: Creatures you control get +1/+1 until end of turn.

Reclaiming Vines

Destroy target artifact, enchantment, or land.

Stasis Snare

Flash (You may cast this spell any time you could cast an instant.)
When this enchantment enters, exile target creature an opponent controls until this enchantment leaves the battlefield.