msem-instigator

{3}, {T}, Sacrifice a non-Spirit creature: Create a 1/1 white Spirit creature token with flying.

Menace (This creature can't be blocked except by two or more creatures.)
When Spawn of Shadows enters the battlefield, each player loses 4 life.

Instant and sorcery spells your opponents cast cost {1} more to cast.

When Spellbound Gauntlet enters the battlefield, put a +1/+1 counter on target creature you control.
{T}: Add one mana of any color.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast an instant or sorcery spell, you may draw a card. If you do, discard a card.

Flying
Whenever Spellgorger Elemental attacks, discard a card at random. If an instant or sorcery card is discarded this way, Spellgorger Elemental deals 3 damage to any target. Otherwise, draw a card.

Whenever you cast your second spell each turn, if it's an instant or sorcery spell, you may pay {1}{R}. If you do, gain control of target creature an opponent controls until end of turn. Untap that creature. It gains haste until end of turn.

When Spinegraft Disabler enters the battlefield, exile target creature until Spinegraft Disabler leaves the battlefield.

({T}: Add {R} or {W}.)
Spiraling Canyon enters the battlefield tapped unless you control a basic Mountain or a basic Plains.

Whenever a land enters the battlefield under your control, you may pay {1}. If you do, create a 1/1 green Saproling creature token.

As an additional cost to cast this spell, sacrifice a permanent.
Sporesowed Disease deals 3 damage to any target and you gain 3 life.

Trample (This creature can deal excess combat damage to defending player or planeswalker while attacking.)
Sprareos Yearling gets +4/+4 as long as you control five or more lands.

Target creature gets -2/-2 until end of turn. When that creature dies this turn, create a tapped 2/2 black Zombie creature token.

When Spreading Dissent enters the battlefield, exile all creatures until Spreading Dissent leaves the battlefield.
{X}: Put a random creature card with mana value X exiled with Spreading Dissent onto the battlefield. Any player may activate this ability.

{T}: Add {C}.
{4}, {T}: Create a 0/1 white Goat creature token.
{T}, Sacrifice X Goats: Add X mana of any one color. You gain X life.

Whenever a creature enters the battlefield under your control, if you didn't cast it from your hand, put a +1/+1 counter on it.
{3}{W}: Exile target creature you control, then return it to the battlefield under its owner's control.

Flash (You may cast this spell any time you could cast an instant.)
When Stampede Instigator enters the battlefield, target creature gets +2/+3 until end of turn.

Target creature gets +1/+0 and gains double strike until end of turn.

Steel Hunter can't attack unless you control three or more other artifacts.

Steelborn Apprentice gets +1/+1 as long as you control an Equipment.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever Steelhoof Battlechief attacks, another target attacking creature you control gets +2/+2 and gains trample until end of turn.

Trample

Stonework Idol's power and toughness are each equal to the number of creatures you control.

Stormbred Elemental gets +1/+1 as long as you control an Island.
{U}: Stormbred Elemental gains flying until end of turn.