msem-instigator

As an additional cost to cast this spell, sacrifice a creature.
Target creature gets -X/-X until end of turn, where X is the sacrificed creature's power.

Lands you control have “{T}: Add one mana of any color.”
{T}: Add one mana of any color.

Death knell — Add {G}. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)
{W}{B}{G}: Trigger a death knell of target permanent you control.

When Churning Spellroot enters, create three 1/1 black Worm creature tokens.

Citadel Bagworm gets +0/+1 for each card in your graveyard.
{B}, Discard a card: Switch Citadel Bagworm's power and toughness until end of turn.

As Citadel Gates enters, you may pay 3 life. If you don't, it enters tapped.
{T}: Add {B}, {R}, or {G}.

{X}, {T}: Reveal the top card of your library. If its mana value is X or less, you may play it without paying its mana cost. Otherwise, put it into your hand. X can't be 0.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)

When Clawing Shaman enters from your graveyard, you may exile it. If you do, return all creature cards from your graveyard to the battlefield.
{4}{B}{B}{B}, Sacrifice a creature: Return Clawing Shaman from your graveyard to the battlefield. Activate only as a sorcery.

Exile target nonland permanent.

{T}, Pay 1 life: Add {W} or {U}.
{1}, {T}, Sacrifice Cleared Vault: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Target creature gets -4/-4 until end of turn.

Whenever you cast a noncreature spell, you may shuffle target card an opponent owns in exile into its owner's library.

{T}, Tap an untapped creature you control: Choose one —
• Add one mana of any color.
• Target player loses 2 life.
• Target player gains 3 life.
• Target player mills four cards.

When Cloister enters, exile another target nonland permanent you control and target nonland permanent you don't control until Cloister leaves the battlefield.
{2}{W}, Sacrifice Cloister: You gain 5 life.

Flying
Whenever you cast a spell, create a 1/1 blue Boar Dragon creature token with flying.

({T}: Add {U}.)
Cloudbank enters tapped.
When Cloudbank enters, target creature gains flying until end of turn.

Flying
When Cloudchaser Kestrel enters, destroy target enchantment.
{W}: Target permanent becomes white until end of turn.

Flying
Whenever Cloudfisher deals combat damage to a creature, gain control of that creature for as long as you control Cloudfisher.
Whenever Cloudfisher deals combat damage to a player, gain control of target land that player controls for as long as you control Cloudfisher.

Flying
When Cloudshaper enters, return a permanent you control to its owner's hand.

Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)
Whenever you cast a spell that doesn't share a color with Cloudstep Capuchin, Cloudstep Capuchin gains flying and hexproof until end of turn.

Flying
{3}{R}, {T}: Cloudwing deals 2 damage to target creature. You may tap or untap that creature.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Other artifacts you control have extort.
Whenever a spell you control resolves, if it was extorted three or more times, each opponent discards a card and you draw a card.

Equipped creature gets +1/+1 and has vigilance.
Equip {1}