msem-instigator

Deathtouch

Choose one —
• Destroy target artifact.
• Destroy target enchantment.
• Destroy target creature with flying.

Choose two —
• Target player creates a 3/3 green Wurm creature token.
• Target player puts three +1/+1 counters on a creature they control.
• Return target permanent card from your graveyard to your hand.
• Destroy target creature with flying.

When Sandwurm's Might enters the battlefield, you may have target creature you control fight target creature you don't control.
Each creature you control enters the battlefield with an additional +1/+1 counter on it.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
Whenever Seeker of Ruins deals combat damage to a player, put a +1/+1 counter on it.

Search your library for a Desert card or a land card with a basic land type and put it onto the battlefield tapped, then shuffle.

Whenever you cast a cryptic spell, put a +1/+1 counter on Spiny Lizard. (Artifacts, enchantments, and modal spells are cryptic.)
When Spiny Lizard dies, you gain life equal to its power.

Hexproof
Cycling {3} ({3}, Discard this card: Draw a card.)

You may have Surging Wurm assign its combat damage as though it weren't blocked.
Surging Wurm gets +2/+2 as long as seven or more cards are in your graveyard.

Whenever Titanic Hardshell deals combat damage to a player, draw a card.
{2}{G}: Titanic Hardshell gains trample until end of turn.

Enchant creature
When Tomb Robber's Grit enters the battlefield, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Enchanted creature gets +1/+1.

Trained Reptile gets +1/+1 for each enchantment you control.
Trained Reptile can't be blocked by creatures with power 2 or less.

Trample
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
Whenever Tribal Guard mentors a creature, that creature gains trample until end of turn.

As Unlikely Growth enters the battlefield, choose grow or maintain.
Whenever a land enters the battlefield under your control,
• Grow — Put a +1/+1 counter on target creature you control.
• Maintain — Target creature you control gains trample and indestructible until end of turn.

Whenever Warrior of Far-Off Sands attacks, it gets +1/+1 until end of turn for each creature you control that's enchanted or equipped.

Flying
{T}, Exile two cards from your graveyard: Add one mana of any color.

Vigilance
{X}{G}, {T}: Ylda, the Wild Soul becomes a copy of target creature you control with mana value X, except it has this ability and vigilance. Activate only as a sorcery.

Choose three. You may choose the same mode more than once.
• Put a +1/+1 counter on up to one target creature you control, then you may have it fight target creature you don't control.
• Target player creates a 2/2 green Lizard creature token.
• You mill four cards and gain 4 life.

Flying, prowess
Whenever an artifact enters the battlefield under your control, you may draw a card. If you do, discard a card.

Flying
When Calamity Harbinger enters the battlefield, it deals 4 damage to up to one target creature or planeswalker.

[+2]: You may sacrifice a permanent or discard a card. If you do, draw a card.
[–X]: Return target creature card with mana value X or less from your graveyard to the battlefield.
[–8]: You get an emblem with “Whenever a permanent you control dies, return a permanent card with lesser mana value from your graveyard to the battlefield.”

Menace, haste
Whenever another creature dies, you get a blood counter.
{B}{R}, Pay two blood counters: Return Dthan, Who Bloodies the Sands from your graveyard to the battlefield.

Menace
When The Duneborn Host enters the battlefield, mill four cards.
Whenever a card is put into your graveyard from anywhere, each opponent loses 1 life and you gain 1 life.
Whenever a card leaves your graveyard, create a 2/2 black Zombie creature token.

{1}{R}, {T}, Sacrifice an artifact: Elise, Maktali Prodigy deals 2 damage to any target.
{1}{U}, {T}, Sacrifice an artifact: Return target nonland permanent to its owner's hand.
{3}{U}{R}, {T}, Sacrifice three artifacts: Discard your hand, then draw seven cards.

Whenever a land enters the battlefield under your control, add one mana of any color.
Whenever Enraged Fangwurm attacks, you may sacrifice a land. If you do, Enraged Fangwurm deals 2 damage to target player or planeswalker.