msem-instigator

The Oltenen Emissary is all colors.
You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast. When you do, you may cast spells without paying their mana costs until end of turn.

Lifelink
Converge — When Adapted Explorer enters the battlefield, it deals X damage to up to one target tapped creature, where X is the number of colors of mana spent to cast it.

Vigilance
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.)

Flying

Creatures you control get +1/+1 until end of turn.
Artifact creatures and Elementals you control get +1/+1 until end of turn.

Whenever Combat Technician attacks, create a 1/1 colorless Servo artifact creature token that's tapped and attacking. Then Combat Technician gets +1/+1 until end of turn for each artifact you control.

Destroy all creatures and planeswalkers. If five or more colors of mana were spent to cast Cosmic War, return a creature or planeswalker card from your graveyard to the battlefield.

Enchant creature
Enchanted creature gets +2/+2 and has “Whenever this creature attacks, tap target creature defending player controls.”

When Covert Reinforcement enters the battlefield, exile target nonland permanent an opponent controls until Covert Reinforcement leaves the battlefield.

When Disassociate enters the battlefield, exile target creature until Disassociate leaves the battlefield.

When Exergetic Chains enters the battlefield, exile target nonland permanent you don't control and up to one target creature you control until Exergetic Chains leaves the battlefield.

First strike, vigilance
Spells that your opponents cast that target First Wave Explorer cost {2} more to cast.

When Glowspore Grove enters or leaves the battlefield, create a 1/1 blue Elemental creature token with flying.

When Glowspore Swarmgrounds enters the battlefield, create two 1/1 blue Elemental creature tokens with flying.
Elementals you control get +1/+1.

Tap up to two target creatures.
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.)

At the beginning of your upkeep, if each opponent controls more lands than you, search your library for a basic land card, reveal it, and put it into your hand, then shuffle.

Vigilance
Augmented — Whenever Jacque attacks, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, you may exile any number of target nonland permanents, then return them to the battlefield tapped under their owners' control.

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.)

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

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.

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

Flash
{1}{W}: Return Nimble Explorer to its owner's hand.

Converge — When Operations Manager enters the battlefield, create X 1/1 colorless Servo artifact creature tokens, where X is the number of colors of mana spent to cast Operations Manager.

Exile target creature. That creature's controller creates a 1/1 blue Elemental creature token with flying.

Vigilance
When Paired Pathfinders enters the battlefield, if three or more colors were spent to cast it, create a 1/1 colorless Servo artifact creature token.