msem-instigator

{T}: Create a 1/1 colorless Servo artifact creature token.
{T}, Sacrifice an artifact: Killdrone Assembly Works deals 1 damage to any target.

When Killdrone Engineer enters the battlefield, create a 1/1 colorless Servo artifact creature token.
Artifacts you control have deathtouch.

Return any number of lands you control to their owner's hands. For each land returned this way, search your library for a land card, reveal it, then put it into your hand. Then shuffle.

Creatures you control get +2/+2 until end of turn.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

Converge — Let It Burn enters the battlefield with a charge counter on it for each color of mana spent to cast it.
{1}{R}, Remove a charge counter from Let It Burn: It deals 3 damage to any target.
When there are no charge counters on Let It Burn, return it to its owner's hand.

Living Vista enters the battlefield tapped.
{T}: Add {G} or {W}.
{1}, {T}: Add one mana of any color.

As long as you control no other Humans, Lone Survivor gets +2/+2 and has “Noncreature spells cost {1} more to cast.”

Trample
Augmented — When Lonely Giant enters the battlefield, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, put two +1/+1 counters on it.

Counter target spell. Create a 1/1 blue Elemental creature token with flying.

Target player discards two cards.

Flying
Whenever Lower Stratosphere Destroyer blocks or becomes blocked by a creature with flying, it gets +2/+2 until end of turn.
Crew 2

Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)
{1}{R}, Remove a +1/+1 counter from Lt. Daisy Saxon: She deals 2 damage to target player or planeswalker.

Reach
Lupine Skygrazer enters the battlefield with a +1/+1 counter on it if three or more colors of mana were spent to cast it.

This spell costs {X} less to cast, where X is the number of creatures you control.
Vigilance

{2}: Exile up to two target cards in a single graveyard. If two creature cards were exiled this way, create a 1/1 blue Elemental creature token with flying.

Marshy Vista enters the battlefield tapped.
{T}: Add {B} or {R}.
{1}, {T}: Add one mana of any color.

Other Elementals you control get +2/+2.
Whenever one or more Elementals you control attack, tap up to one target creature you don't control.

Menace

Flying
When Mineral Retriever enters the battlefield, create a Treasure token.

When Mining Rover Manager enters the battlefield, create a 1/1 colorless Servo artifact creature token.

As Nebula of Empty Gold enters the battlefield, choose two or more colors. You lose life equal to the number of colors chosen this way.
{T}: Add one mana of any of the chosen colors.

Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Add one mana of any color.

Return target nonland permanent to its owner's hand.
Exile target nonland permanent you control, then return it to the battlefield under your control.

As New Divide enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.
{T}, Sacrifice New Divide: Search your library for a basic land card, put it onto the battlefield, then shuffle.