msem-instigator

Create a token that's a copy of target creature, except it's a Sand creature in addition to its other types, has haste and “At the beginning of the end step, sacrifice this permanent.” Each creature with the same name as that creature gains trample until end of turn.

Prowess
Whenever an artifact you control enters, you may discard a card. If you do, draw a card.

Equipped creature gets +2/+2 and has deathtouch and lifelink.
Whenever equipped creature dies, you may exile it. If you do, return target Knight or Soldier card from your graveyard to the battlefield tapped, then attach The Roseblade to it.
Equip {2}

When Gemplate Golem enters or dies, put a +1/+1 counter on target creature you control.

I, II, III — Target creature gets -X/-X until end of turn, where X is the number of lore counters on A Grave Sentence.
IV — Target opponent loses 1 life for each creature card in their graveyard.
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Untap up to two target lands you control. Those lands become the basic land type of your choice until end of turn.
Draw a card.

This spell has flash as long as you control a permanent with flash.
Put target nonland permanent on top of its owner's library.

Menace (This creature can't be blocked except by two or more creatures.)
Swampcycling {2} ({2}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

{T}: Look at the top and bottom card of your library. Put up to one on top of your library and the rest on the bottom in any order.
{2}: Mill a card.

Whenever you cast a noncreature spell, put a +1/+1 counter on Anointed Truthseeker. Up to one target creature can't block Anointed Truthseeker this turn.

When Graygulch Howler dies, you gain 1 life for each Spirit you control.

Enchant non-Army creature
When Sinking Pessimism enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Enchanted creature has “{4}: Untap this creature. If it untapped this way, put a stun counter on it.”

Whenever Ensnaring Possessor attacks, you may tap or untap target permanent.
{1}{U}, {T}: Until end of turn, target creature gets +1/+1 and gains “Whenever this creature attacks, you may tap or untap target permanent.” Activate only as a sorcery.

Trample, haste
Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)

Creatures and nonbasic lands your opponents control enter tapped.
Morph {3}{W}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When you turn Embodiment of Order face up, it becomes a 4/4 white Angel creature with flying.

When Something in the Woods enters or at the beginning of your upkeep, Something in the Woods explores. If it explores a creature card, you may have it become a copy of that card. (It loses this ability. To explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this, then you may put that card into your graveyard.)

This spell costs {1} less to cast and has flash as long as there are four or more card types among cards in your graveyard.
Draw two cards.

Equipped creature gets +2/+0 and has haste.
Equip {2}

Mill three cards, then counter target spell unless its controller pays {X}, where X is the greatest mana value among cards milled this way.

Sacrifice Moonlight Agent: Blocking creatures gain first strike until end of turn.

Assault {2}{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 Wildborn Marauder assaults, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Whenever Sphinx's Grandeur or another enchantment you control enters, create a 1/1 white Soldier creature token.
Creatures you control get +1/+1.

When Theurgist of the Depths enters, for each card type, you may exile a card of that type from your graveyard. Target opponent separates those cards into two piles. Put all cards from the pile of your choice into your hand.
Recite {B}{G}{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.)

Whenever a creature dies, you may pay 1 life. If you do, draw a card.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)