msem-instigator

Charred Marsh enters tapped unless you control a Mountain.
{T}: Add {B} or {G}.

Escalate {R}{R} (Pay this cost for each mode chosen beyond the first.)
Choose one or more. You may choose the same mode more than once.
• Culminating Chaos deals 2 damage to each creature and each planeswalker.
• Exile the top two cards of your library and add {R}{R}. Until end of turn, you may play those cards.

Motley Crew has no name while it's being cast. (It will always make first contact.)
{2}{R}: Creatures you control named Motley Crew get +1/+0 until end of turn.

{U}: Sea Strider gets +1/-1 until end of turn.
{U}: Sea Strider gets -1/+1 until end of turn.

{T}: Add {C}.
{1}, {T}: Add one mana of any color.

When Seeker of Horizons enters, reveal the top three cards of your library. You may put a permanent card from among them into your hand. Put the rest on the bottom of your library in any order.
Recite {1}{U} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

Scry 1, then reveal the top card of your library. If it's a land card, put it into your hand.
Draw a card.

When Driver of Hordes enters, create a tapped 2/2 black Zombie creature token.
Unearth {3}{B} ({3}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)

Create a 1/1 red Goblin creature token and a 2/2 white Knight creature token.
Tether to artifact (Then if you cast this from your hand, you may exile it tethered to an artifact you control. When it dies, you may cast this from exile without paying its mana cost.)

Whenever Skitterthorns blocks or becomes blocked, creatures you control gain deathtouch until end of turn.

Destroy target artifact or tapped creature.

Deathtouch
Whenever Withered Elk deals combat damage to a player, that player loses half their life, rounded down.

{U}, Exile a card from your hand or graveyard that doesn't share a type with a card exiled by Tea of Augury: Draw a card.

Glorious end — When Toros the Warchief dies, if it was tapped, return it to the battlefield at the beginning of the next end step.
Attacking creatures you control have deathtouch.

{1}, Sacrifice Curious Fossil: Scry 2.
{2}{U}: Return Curious Fossil from your graveyard to the battlefield transformed. Activate only during your turn.

Vigilance, reach
Deploy 5 (As this enters, you may tap any number of other creatures you control with total power 5 or more.)
When Earthly Principality enters deployed, your life total becomes equal to your starting life total plus 5.

Enchant creature you control
Enchanted creature gets +3/+3.
When Belligerence enters, enchanted creature fights target creature an opponent controls.
When enchanted creature dies, if it's a Warrior, return Belligerence to its owner's hand.

Sacrifice a creature: Put a +1/+1 counter on Masked Assailant. It gains menace until end of turn. Activate only as a sorcery.

Equipped creature can't have -1/-1 counters put on it.
Equip {1}

Target player discards two cards unless they discard a noncreature, nonland card.

Enchant creature
Enchanted creature has flying.
Whenever enchanted creature deals combat damage to a creature, you may untap enchanted creature.

Put a +1/+1 counter on target creature you control. Untap that creature.

Put target creature on top of its owner's library.
Quickdraw {2}{U} (When a creature you control blocks or becomes blocked, you may cast this spell for {2}{U}.)

Put a +1/+1 counter on each creature you control. Creature tokens you control gain vigilance until end of turn.