msem-instigator

Menace (This creature can't be blocked except by two or more creatures.)
Whenever a nontoken creature you control dies, exile the top card of your library. You may play that card until the beginning of your next end step.

Assault {2}{R} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Monstrous Hila assaults, it deals 3 damage to any target.

Unattach all Equipment from target creature. Piercing Blow deals 3 damage to that creature.

When Primordial Progenitor dies, create two 1/1 red Elemental creature tokens.

Destroy target land. Sandburst deals 1 damage to each creature without flying your opponents control.

Flying
Whenever Scavenging Hilakites attacks, you may sacrifice another creature. When you do, Scavenging Hilakites deals damage equal to the sacrificed creature's power to any target.

[+1]: Up to two target creatures you control each get +1/+0 and gain first strike until end of turn.
[0]: You may sacrifice a creature. If you do, Shala Na, Urshadi Apostate deals 3 damage to any target.
[–3]: Discard your hand, then draw three cards.

Shock deals 2 damage to any target.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Slaughtered Steps Taskmaster attacks, you may sacrifice another creature. If you do, Slaughtered Steps Taskmaster gets +2/+0 until end of turn.

Flying, haste
Assault {1}{R} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
Whenever one or more +1/+1 counters are put on a creature you control, you may return Sunnula's Firebird from your graveyard to your hand.

Target creature gets +3/+0 and gains first strike until end of turn.

Torrent of Ankuliths deals 5 damage to target creature. Create a 1/1 red Elemental creature token.

Assault {X}{R}{R} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
Other Elementals you control get +1/+0.
When Unbound Annihilus assaults, create X 1/1 red Elemental creature tokens that are tapped and attacking.

Haste
When Urud Stingswoop enters, it gains flying until end of turn.

Assault {1}{R} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Urudi Warlord assaults, it gains first strike until end of turn.

I, II — Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Discovery — {4}: You gain 2 life.

{G}, {T}, Remove a +1/+1 counter from a creature you control: Create a 2/2 green Ox creature token.

Assault {1}{G} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Caprin Outlander assaults, you gain 3 life.

Destroy target artifact or enchantment with mana value 4 or less.

Assault {3}{G} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Crushclaw Pulverizer assaults, you may destroy target artifact or enchantment.

Prevent all combat damage that would be dealt this turn except by creatures you control with +1/+1 counters on them.

Assault {1}{G} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Dune Tromper assaults, it gains trample until end of turn.

Choose one —
• Target creature you control deals damage equal to its power to another target creature or planeswalker.
• Target planeswalker you control deals damage equal to the number of loyalty counters on it to target creature or planeswalker.

Choose X. You may choose the same mode more than once.
• Put two +1/+1 counters on target creature you control.
• Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
• Destroy target artifact or enchantment.

Mill three cards, then you may return a creature or land card from your graveyard to your hand. (To mill three cards, put the top three cards of your library into your graveyard.)