Citadel Siege

As Citadel Siege enters, choose Khans or Dragons.
• Khans — At the beginning of combat on your turn, put two +1/+1 counters on target creature you control.
• Dragons — At the beginning of combat on each opponent's turn, tap target creature that player controls.

Civil Servant

Whenever Civil Servant attacks, you may tap another untapped Citizen you control. If you do, Civil Servant gets +1/+0 and gains lifelink until end of turn.

Plains

Brokers Initiate

{4}{G/U}: Brokers Initiate has base power and toughness 5/5 until end of turn.

Rupture Spire

Rupture Spire enters tapped.
When Rupture Spire enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.

Spara's Adjudicators

When Spara's Adjudicators enters, target creature an opponent controls can't attack or block until your next turn.
{2}, Exile Spara's Adjudicators from your hand: Target land gains "{T}: Add {G}, {W}, or {U}" until Spara's Adjudicators is cast from exile. You may cast Spara's Adjudicators for as long as it remains exiled.

Speakeasy Server

Flying
When Speakeasy Server enters, you gain 1 life for each other creature you control.

Gathering Throng

When Gathering Throng enters, you may search your library for any number of cards named Gathering Throng, reveal them, put them into your hand, then shuffle.

Gilded Pinions

When Gilded Pinions enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
Equipped creature has flying.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Botanical Plaza

Botanical Plaza enters tapped.
{T}: Add {G} or {W}.
{2}{G}{W}, {T}, Sacrifice Botanical Plaza: Draw a card.

Knockout Blow

This spell costs {2} less to cast if it targets a red creature.
Knockout Blow deals 4 damage to target attacking or blocking creature and you gain 2 life.