msem-instigator

Flying
Other creatures you control enter with an additional +1/+1 counter on them.
If a spell or ability an opponent controls causes you to discard Sigarda, Dawn of Mercy, put it onto the battlefield instead of putting it into your graveyard.

Flying
Whenever another Spirit or another creature with flying you control enters, put a +1/+1 counter on Tattergeist.

Trample
Whenever this creature enters or transforms into Valseid, Leyran Brute, it deals 2 damage to any target that isn't a blocking creature and you gain 2 life.
{3}{R}{G}: Transform Valseid, Leyran Brute. Activate only if it's attacking.

Trample
Whenever this creature transforms into Valseid, Leyran Ravager or you cast a Wolf or Werewolf spell, Valseid, Leyran Ravager deals 2 damage to any target that isn't a blocking creature and you gain 2 life.
At the beginning of your end step, if Valseid didn't attack this turn, transform it.

Lifelink
Creature tokens you control get +1/+0.
Whenever a token you control enters, each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn.

Trample
{2}{G}{U}: Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.

Whenever you gain life, draw a card. This ability triggers only once each turn.
{6}: Angelic Statue becomes a 3/3 white Angel creature with flying and lifelink until end of turn.

First strike
Whenever Bodyless Knight attacks, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Defender
When Demonrune Wall enters, exile target creature or enchantment an opponent controls until Demonrune Wall leaves the battlefield.

Exsanguinator enters with X pain counters on it.
Whenever equipped creature attacks, each opponent loses X life and you gain X life, where X is the number of pain counters on Exsanguinator.
Equip {4}

Flying, vigilance
When Guardian Grotesque dies, return up to one target nonland permanent to its owner's hand.
Foreshadow {6} (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

Reach, trample
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
Whenever one or more tokens you control enter, put a +1/+1 counter on Harvesttide Nemesis. This ability triggers only once each turn.

When Helvault, Shard of the Moon enters, for each player, exile up to one other target nonland permanent that player controls until Helvault, Shard of the Moon leaves the battlefield. When you exile a permanent you control this way, draw three cards.
{T}: Add {C}{C}{C}{C}{C}.
Cycling {2} ({2}, Discard this card: Draw a card.)

When Hunter's Arsenal enters, create a Weapon token. (It's an Equipment artifact with “Equipped creature gets +1/+1” and equip {2}.)
{1}, {T}, Sacrifice Hunter's Arsenal: Search your library for a basic land card, reveal it, put it into your hand, then shuffle. You gain 2 life.

Indestructible
When Phylactery of Forbidden Arts enters, search your library for up to three instant and/or sorcery cards with different names, put them into your graveyard, then shuffle.
{T}: Add three mana of any one color. Spend this mana only to cast spells from your graveyard or activate abilities from your graveyard.

When Pulse Seeker enters, create a 1/1 black and red Vampire creature token with menace.
Equipped creature gets +1/+0.
Equip {1}

As Scrolls of Succession enters, choose a creature type.
Creatures you control of the chosen type get +1/+1.
{2}, {T}: Draw a card. Then discard a card unless you control three or more creatures of the chosen type.

When Soul-Capturing Lantern enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{1}, {T}: Add one mana of any color.
{6}, {T}, Sacrifice Soul-Capturing Lantern: Exile target nonland permanent. Activate only as a sorcery.

Whenever equipped creature attacks, choose one —
• Tap target creature.
• Draw a card, then discard a card.
• Exile target card from a graveyard.
Equip {3}

Flying, menace, trample
When The Wickerscreech of Gatstaf dies, destroy target nonland permanent an opponent controls.
Foreshadow {13}. This costs {1} less for each nonland card in your graveyard. (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

Blessed Grounds enters tapped. When it enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{T}: Add {G} or {W}.

Coastal Cairn enters tapped. When it enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{T}: Add {U} or {R}.

Eerie Wildwood enters tapped. When it enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{T}: Add {R} or {G}.

{T}: Add {C}.
{4}, {T}, Sacrifice Elgaud Fortress: Create a token that's a copy of target artifact you control. Activate only as a sorcery.

Fog-Ridden Wharf enters tapped. When it enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{T}: Add {W} or {U}.