msem-instigator

({T}: Add {W} or {U}.)
Rainsculpted Gorge enters the battlefield tapped.
{1}, {T}: Add {W}{W} or {U}{U}.

Shadowcleft Hideout enters the battlefield tapped.
{T}: Add {B}.
{T}, Pay 2 life, Sacrifice Shadowcleft Hideout: Draw a card.

({T}: Add {B} or {G}.)
Shuddering Node enters the battlefield tapped.
{1}, {T}: Add {B}{B} or {G}{G}.

Skylight Fortress enters the battlefield tapped.
When Skylight Fortress enters the battlefield, you may search your library for a card named Skylight Fortress, reveal it, put it into your hand, then shuffle.
{T}: Add {C}.

{T}: Add {C}.
{T}: Add one mana of any color. You can't spend this to cast spells from your hand.

({T}: Add {G} or {U}.)
Soaring Rainforest enters the battlefield tapped.
{1}, {T}: Add {G}{G} or {U}{U}.

({T}: Add {U} or {R}.)
Steamlit Peaks enters the battlefield tapped.
{1}, {T}: Add {U}{U} or {R}{R}.

Tears of Tizuma enters the battlefield tapped.
{T}: Add {U}.
Whenever Tears of Tizuma becomes tapped for mana, target player mills a card.

({T}: Add {G} or {W}.)
Timeless Shrine enters the battlefield tapped.
{1}, {T}: Add {G}{G} or {W}{W}.

{T}: Add {C}.
{1}: Tomb of Shifting Sands becomes a copy of target land card in any graveyard, except it has this ability and it's a Desert in addition to its other types. (This effect lasts indefinitely.)

{T}: Add {C}.
{T}, Sacrifice Untethered Spire: Choose target land card in your graveyard that was put there from the battlefield this turn. Return that card to your hand.

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast Aura or Aurashaper spells.

{3}, Reveal Zhedina Outskirts from your hand: Put Zhedina Outskirts from your hand onto the battlefield tapped.
{T}: Add {C}.
{1}, {T}: Add one mana of any color.

{1}{W}: Aegis Champion gains indestructible until end of turn.

{2}{W}: Audacious Knight gains first strike and vigilance until end of turn. (It deals combat damage before creatures without first strike. Attacking does not cause it to tap.)

Creatures you control get +2/+1 until end of turn. Scry 1.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Create three 1/1 white Soldier creature tokens.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever a creature you don't control blocks, it gets -1/-0 until end of turn.

Enchant creature
When Divine Ascension enters the battlefield, you gain 2 life.
Enchanted creature gets +2/+1 and has flying.

Destroy target creature that dealt damage to a creature you control this turn.

Each player chooses a creature with the least power among creatures they control. Then destroy the rest.

[+1]: Creatures you control get +0/+1 until your next upkeep. Untap those creatures.
[–2]: Put target tapped creature into its owner's library third from the top.
[–7]: You get an emblem with “Whenever a nonland permanent you control is put into a graveyard from the battlefield, each opponent sacrifices a nonland permanent.”

First strike
When Gavis's Dragoons enters the battlefield, exile another target creature until Gavis's Dragoons leaves the battlefield.
Spells with the same name as the exiled card can't be cast (as long as this creature is on the battlefield.)