I remember enjoying a Necromancer themed deck in Elder Scrolls Legends with various degrees of success, I think such a deck with a bit of power/control could be really effective in this game. This deck power rush in order to bring out powerful agents but beware the power gain does come at a cost such as losing prestige since Necromancy is illegal lol. Here are some rough ideas I thought of.

Necromancer patron/deck
- pay 2 or 3 power to summon a contract skeletal guardian with 2 health + taunt

Bone Colossus (agent) 9 cost / 5 health / taunt
Gain 2 power
Combo 2 - 1 power
Combo 3 - 2 power
Combo 4 - 3 power

Bone Goliath (agent) 10 cost / 5 health / taunt (Bone Colossus upgrade)
Gain 3 power
Combo 2 - 1 power
Combo 3 - 2 power
Combo 4 - 3 power

Dread Lich (agent) 7 cost / 2 health
Gain 1 power
Combo 3 - move 1 card to the top of your deck
Combo 4 - move 1 card to the top of your deck

Graverobber (action) 4 cost
Move a card to the top of your deck
Combo 2 - draw a card
Combo 3 - you lose 1 prestige

Skeletal Guardian (Contract agent) 4 cost / 2 health / taunt

Bone horror (agent) 2 cost / 1 health / taunt

Burial Ritual (action) 5 cost
Move 1 card to the top of your deck
Combo 2 - Acquire 1 card up to the cost of 6
Combo 3 - you lose 1 prestige

Bloodbound Curse (action) 4 cost
Gain 3 power
Combo 2 Opponent loses 1 prestige
Combo 3 you lose 1 prestige

Black Soulgem (contract action) 5 cost
Gain 4 power
Combo 3 - Gain 2 power

Flesh Atronach (agent) 6 cost / 4 health / taunt
Gain 1 power

Cursed Wraith (agent) 6 cost / 2 health / taunt
Gain 1 power
Combo 2 - Gain power
Combo 3 - Opponent loses 1 prestige
Combo 4 - you lose 1 prestige

Soul Drain (action) 4 cost
Gain 2 power
Combo 2 - Gain 2 power

Gravedigger (Agent) 6 cost / 1 health
Draw a card
Combo 2 - Gain 1 coin

Gravesinger (agent) 7 cost / 1 health (Gravedigger upgrade)
Draw a card
Combo 2 gain 1 coin
Combo 3 - move a card to the top of your deck