msem-instigator

Counter target spell with mana value 3 or less. If a spell is countered this way, return it to its owner's hand instead of putting it anywhere else.

At the beginning of each combat, if you control a creature with flying, Magnific Wilderkin gets +1/+1 and gains flying until end of turn. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Enchant creature you control
Vanishing 3 (This permanent enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Enchanted creature gets +3/+3.
When Vampiric Appetite leaves the battlefield, sacrifice enchanted creature.

You may reveal a Knight or Soldier card from your hand as you cast this spell. If you do or you control one as you cast it, you may cast it as though it had flash and it can't be countered.
Exile target nonland permanent with mana value 3 or less.

Counter target activated or triggered ability of a nonland source. If an ability of a creature, enchantment, or planeswalker is countered this way, exile it.

Prevent all damage that would be dealt to creatures and to you this turn.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
Other creatures you control with distorted get +2/+2.

This spell costs {1} less to cast for each tapped creature you control.
Whenever Incarnation of Enmity attacks, each other attacking creature gets +1/+0 until end of turn.

Enchant creature
As Legacy of Dawn Hill enters, choose a creature type.
Enchanted creature gets +2/+0, has first strike, and is the chosen type in addition to its other types.

Trample
Chronicle (As this enters and after your draw step, add a lore counter. Stop after III.)
[Lore I-II] Creatures you control gain vigilance until end of turn.
[Lore III] Remove all lore counters from Astral Leucrocota. You gain 4 life.

Mortal Tapestry gets +1/+1 for each land card in your graveyard.
Revive {4}{G} ({4}{G}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

When Hollowflesh Ghoul dies, create a 1/1 black Skeleton creature token.

When The Dreadmoon Ascendancy enters, you may put two -1/-1 counters on target creature.
Whenever you put one or more counters on one or more other permanents, you may put a bale counter on The Dreadmoon Ascendancy.
{B}, Pay 1 life, Remove a bale counter from The Dreadmoon Ascendancy: Draw a card.

Search your library for a basic land card and a Desert card, put them onto the battlefield tapped, then shuffle.

Snow Drift enters tapped. When it does, it explores. (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.)
{T}: Add {U}.
{4}{U}: Snow Drift becomes an Elemental creature. (This effect lasts indefinitely.)

Landfall — Whenever a land you control enters, target player loses 1 life and you gain 1 life.

Enchant creature
Enchanted creature and all other creatures with the same name as that creature can't attack or block.

Flying
When Champion's Steed enters, put a flying counter on target Avatar you control without flying.

Menace
Titan of Fallen Stars gets +1/+1 from -1/-1 counters instead of -1/-1.
When Titan of Fallen Stars enters, move any number of -1/-1 counters from creatures you control onto Titan of Fallen Stars.

Choose target creature you control and target creature you don't control. Flip a coin. If the coin comes up heads, put one of those creatures on top of its owner's library. Otherwise, put both of them on top of their owners' libraries.

Flying
Whenever you cast a noncreature spell, note its mana value.
When Strix of Dark Omens dies, draw a card and create a 1/1 blue Bird creature token with flying for each different number noted with it.

When Daughter of Calenfyr enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.
When Daughter of Calenfyr dies, you may put a land card from your hand onto the battlefield tapped.

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.

Augmented — If you've spent {W}{U}{B}{R}{G} to cast spells this turn, you may cast this spell without paying its mana cost.
Counter target spell.

Enchant creature
When Warrior's Discipline enters, put a +1/+1 counter on enchanted creature.
Whenever enchanted creature deals combat damage to a player, double the number of +1/+1 counters on it.