msem-instigator

Sage's Ashes enters the battlefield tapped.
{T}, Sacrifice Sage's Ashes: Put target card from a graveyard on top of its owner's library.
{3}, Exile Sage's Ashes from your graveyard: Draw a card.

{T}: Add {C}.
{2}, {T}: Put target Aura or Equipment card from your graveyard on top of your library.

Flying
Saki of the Sea and Sky gets +1/+1 for each card inscribed onto it and each permanent attached to it.

Flying
Sakura Spirit has lifelink as long as it's equipped, enchanted, or has a card inscribed onto it.

Whenever an opponent attacks you and/or one or more planeswalkers you control, you may draw a card.

Choose a color or card type. Target permanent gains protection from the chosen color or type until end of turn.
Inscribe {3}{W}{U} ({3}{W}{U}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

Flash
Poisonous 2 (Whenever this creature deals combat damage to a player, that player gets two poison counters.)
When Sankataar Ambusher enters the battlefield, if an opponent is poisoned, Sankataar Ambusher gets +2/+2 until end of turn.

Poisonous 3 (Whenever this creature deals combat damage to a player, that player gets three poison counters.)
When Sankataar Assailant enters the battlefield, choose a counter on target permanent or player. Give that permanent or player another counter of that kind.

Poisonous 2 (Whenever this creature deals combat damage to a player, that player gets two poison counters.)
Sankataar Coilborn gets +1/+1 as long as an opponent is poisoned.

Poisonous 5 (Whenever this creature deals combat damage to a player, that player gets five poison counters.)
At the beginning of your upkeep, if an opponent is poisoned, you may destroy target Human.

Poisonous 2 (Whenever this creature deals combat damage to a player, that player gets two poison counters.)
When Sankataar Scourge dies, if it attacked this turn, target opponent gets a poison counter.

Flying
Improve—{1}{B/R}, Sacrifice a creature. ({1}{B/R}, Sacrifice a creature: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Whenever another creature you control dies, each opponent loses 1 life and you gain 1 life. If that creature was sacrificed, instead each opponent loses 2 life and you gain 2 life.

When Sasori Nightrunner enters the battlefield, create a 2/2 colorless Spirit creature token.
Whenever a colorless creature you control dies, each opponent loses 1 life.

Art of war — At the beginning of your end step, if Sasori Ronin dealt damage to an opponent this turn, it deals 1 damage to any target.

Poisonous 4 (Whenever this creature deals combat damage to a player, that player gets four poison counters.)
At the beginning of combat on each of your turns, if an opponent is poisoned, creatures you control gain trample until end of turn.

Equipped creature gets +1/+1.
Equipped creature has “When this creature dies, if it's not a token, create a token that's a copy of it except it's a colorless Spirit Dragon with flying in addition to its other abilities.”
Equip {2}

Whenever Scarhide, Arsenal Crafter attacks, create a token that's a copy of an Equipment attached to Scarhide and attach the token to Scarhide. When you can't, arm it. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Add three mana of any one color.

Menace
When Scion of Calamities enters the battlefield, exile the top two cards of your library. Until the end of your next turn, you may play one of those cards.
Whenever a Mountain enters the battlefield under your control, you may aetherize Scion of Calamities. (To aetherize, create a token that's a copy of it, then exile that token.)

Deathtouch
When Scion of Desolation enters the battlefield, put target creature card with mana value 3 or less from a graveyard onto the battlefield under your control.
Whenever a Swamp enters the battlefield under your control, you may aetherize Scion of Desolation. (To aetherize, create a token that's a copy of it, then exile that token.)

Trample
When Scion of Flourishing enters the battlefield, put a +1/+1 counter on each other creature you control. Those creatures gain trample until end of turn.
Whenever a Forest enters the battlefield under your control, you may aetherize Scion of Flourishing. (To aetherize, create a token that's a copy of it, then exile that token.)

When Scion of Sarrithaz enters the battlefield, create a 2/2 black Zombie creature token.
{2}{B}, Sacrifice a creature: Draw a card.

Poisonous 2 (Whenever this creature deals combat damage to a player, that player gets two poison counters.)
Snakes you control can't be blocked by creatures with power 2 or less.

Vigilance
When Scion of Storms enters the battlefield, create a 2/2 white Elemental creature token with flying.
Whenever a Plains enters the battlefield under your control, you may aetherize Scion of Storms. (To aetherize, create a token that's a copy of it, then exile that token.)

Flying
When Scion of Torrents enters the battlefield, you may return target nonland permanent to its owner's hand.
Whenever an Island enters the battlefield under your control, you may aetherize Scion of Torrents. (To aetherize, create a token that's a copy of it, then exile that token.)