msem-instigator

As Straw Simulacrum enters the battlefield, choose a creature type.
Straw Simulacrum is the chosen creature type in addition to its other types.
Other creatures you control of the chosen type get +1/+1.

Strider Engine enters tapped and with a -1/-1 counter on it unless you spent at least three colors of mana to cast it.

Equipped creature gets +1/+1 and has haste.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

{2}: Other creatures you control get +1/+0 until end of turn.
Whenever Sun-Crowned Flagship attacks, each attacking creature you control gains trample until end of turn.
Crew 7 (Tap any number of creatures you control with total power 7 or greater: This Vehicle becomes an artifact creature until end of turn.)

Equipped creature gets +1/+0 and gains “Whenever this creature deals damage to a player or planeswalker, you may draw two cards. If you do, discard a card.”
Equip {2}

{1}, {T}: End the turn. Activate only during your turn.

When Sunken Grave enters the battlefield, create a tapped 2/2 black Zombie creature token.
{5}, {T}, Sacrifice Sunken Grave: Create a tapped 2/2 black Zombie creature token.

As Sunlit Highland enters the battlefield, you may pay 2 life. If you don't, Sunlit Highland enters the battlefield tapped.
{T}, Sacrifice Sunlit Highland: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.

Equipped creature has “{T}: This creature deals damage equal to its power to any target.”
Equip {4}

Sunrise Orchard enters the battlefield tapped.
{T}: Untap another target land you control.

When Sunset Monastery enters the battlefield, draw a card, then put a card from your hand on the bottom of your library.
{T}: Add {C}.

Equipped creature has vigilance and “{T}: Add one mana of any color.”
Equip {1}

When Surveyor's Rifle enters the battlefield, rediscover a land card. (Look at the top card of your library. You may reveal it and put it into your hand if it's a land card. Otherwise, put it back or into your graveyard.)
Equipped creature gets +2/+1.
Equip {3}

When Suspect Concoctions enters the battlefield, put a +1/+1 counter on target creature.
{4}, Sacrifice Suspect Concoctions: Put two +1/+1 counters on target creature.

Flying
When Sweeper Drone enters the battlefield, create a Function token with “Put a +1/+1 counter on each creature named Sweeper Drone you control.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Equipped creature gets +2/+2 and protection from black and from red.
Whenever equipped creature deals combat damage to a player, that player loses 3 life unless they discard a card or sacrifice a nonland permanent. You discard a card, then you draw two cards.
Equip {2}

{5}, {T}, Tap an untapped creature you control: Put target card from your or a teammate's graveyard on top of its owner's library.

Equipped creature gets +2/+2 and has protection from green and from white.
Whenever equipped creature deals combat damage to a player, you may reveal the top five cards of your library. Put a creature card revealed this way into your hand, then put the rest into your graveyard. Destroy up to one target enchantment.
Equip {2}

Equipped creature gets +2/+2 and has protection from mana value 2 or less and from mana value 6 or greater.
Whenever equipped creature deals combat damage to a player, create a Food token and two Treasure tokens.
Equip {2}

Whenever equipped creature deals combat damage, you may return target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of damage dealt this way.
Equip {1}

Equipped creature gets +2/+2 and has protection from colorless and from multicolored. This effect doesn't remove Sword of Silver and Gold. (This permanent can't be targeted, dealt damage, enchanted, or equipped by anything colorless or multicolored.)
Whenever equipped creature deals combat damage to a player, you create a 2/2 colorless Spirit creature token and that player exiles the top three cards of their library.
Equip {2}

Equipped creature gets +2/+2 and protection from blue and from black.
Whenever equipped creature deals combat damage to a player, return up to one target creature card and up to one target instant or sorcery card from your graveyard to your hand.
Equip {2}

Equipped creature gets +2/+2 and has protection from white and from blue.
Whenever equipped creature deals combat damage to a player, until your next turn, spells that player casts cost {1} more to cast and spells you cast cost {1} less to cast.
Equip {2}

Equipped creature gets +2/+1.
Whenever a creature enters the battlefield under your control, you may have equipped creature gain your choice of flying, vigilance, first strike or trample until end of turn.
Equip {3}

{T}, Sacrifice Synthetic Seedling: Choose a basic land type. Create a tapped colorless enchantment land token with the chosen type.