Defend the Conclave
Sorcery
Populate. If you do, you may have that creature fight another target creature you don't control.

Conceive -
Sorcery
Populate.
Jump-start

Spring’s Call -
Sorcery
Search your library for a basic land card, reveal it, put it into your hand, then shuffle. If you control an Army with power 4 or greater, amass Squirrels 2.
Jump-start

Conscripting Defenses
Sorcery
Amass Humans 1. If you have the city's blessing, Amass Humans 4 instead.
Ascend

City Brawler

Creature - Human Rogue
Haste
Ascend (If you control ten or more permanents, you get the city’s blessing for the rest of the game.)
City Brawler has menace as long as you have the city’s blessing.
He doesn't need permission to start a fight, but it certainly helps.
3/2

Order of the Ninth Sphere

Creature - Phyrexian Knight
Menace, Deathtouch
Whenever Order of the Ninth Sphere becomes tapped, you may pay . If you do, destroy target non-Phyrexian creature.
"Their blasphemous thoughts. Their profane existence. They insult the Grand Evolution. In Yawgmoth's name, we shall remake them." - Oath of the Ninth
4/4

Diregraf Scourge
Creature - Zombie
Dauntless, Wither
When ~ dies, return it to its owner's hand at end of turn.
[2/3]

Creeping Hellfire

Enchantment
Wither, Cumulative Upkeep
At the beginning of your draw step, Creeping Hellfire deals an amount of damage equal to the number of age counters on it divided as you choose among any number of targets.

Generous Donation

Enchantment - Aura
Enchant creature an opponent controls
Cumulative upkeep—You must gift enchanted creature's owner a treasure. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it. To gift a treasure, enchanted creature's owner creates a Treasure token. It’s an artifact with “, Sacrifice this artifact: Add one mana of any colour.”)
You control enchanted creature.
In Dimir, there's a thin line of difference between a donation and bribe.