Here are some best Mortar Decks:

Ice Wizard Mortar Rage

Ice Spirit
Ice Spirit
Ice Wizard
Ice Wizard
Mortar
Mortar
Rocket
Rocket
Skeletons
Skeletons
The Log
The Log
Tornado
Tornado
Valkyrie
Valkyrie
Elixir
Avg. Elixir
3
COPY DECK

Electro Spirit Hog Rage

Archers
Archers
Electro Spirit
Electro Spirit
Giant Snowball
Giant Snowball
Hog Rider
Hog Rider
Mortar
Mortar
Poison
Poison
Skeletons
Skeletons
Valkyrie
Valkyrie
Elixir
Avg. Elixir
2.9
COPY DECK

Barbarians Bats Mortar Rage

Barbarians
Barbarians
Bats
Bats
Earthquake
Earthquake
Giant Snowball
Giant Snowball
Hog Rider
Hog Rider
Mortar
Mortar
Musketeer
Musketeer
Skeletons
Skeletons
Elixir
Avg. Elixir
3.1
COPY DECK

Skeleton King Witch Rage 

Arrows
Arrows
Lightning
Lightning
Mortar
Mortar
Skeleton King
Skeleton King
Skeletons
Skeletons
Spear Goblins
Spear Goblins
Wall Breakers
Wall Breakers
Witch
Witch
Elixir
Avg. Elixir
3.4
COPY DECK

Archers Ice Spirit Rage

Archers
Archers
Ice Spirit
Ice Spirit
Knight
Knight
Mortar
Mortar
Rocket
Rocket
Skeletons
Skeletons
The Log
The Log
Tornado
Tornado
Elixir
Avg. Elixir
2.9
COPY DECK

Archer Queen Dart Goblin Rage

Archer Queen
Archer Queen
Arrows
Arrows
Dart Goblin
Dart Goblin
Goblin Gang
Goblin Gang
Ice Wizard
Ice Wizard
Knight
Knight
Mortar
Mortar
The Log
The Log
Elixir
Avg. Elixir
3.3
COPY DECK

Bandit Barbarians Rage

Arrows
Arrows
Bandit
Bandit
Barbarians
Barbarians
Battle Ram
Battle Ram
Dark Prince
Dark Prince
Lightning
Lightning
Mortar
Mortar
Musketeer
Musketeer
Elixir
Avg. Elixir
4.1
COPY DECK

Bats Dart Goblin Rage

Barbarian Barrel
Barbarian Barrel
Bats
Bats
Dart Goblin
Dart Goblin
Fireball
Fireball
Knight
Knight
Mortar
Mortar
Skeletons
Skeletons
Wall Breakers
Wall Breakers
Elixir
Avg. Elixir
2.6
COPY DECK

Fire Spirit Archers Rage

Fire Spirit
Fire Spirit
Archers
Archers
Knight
Knight
Mortar
Mortar
Rocket
Rocket
Mirror
Mirror
The Log
The Log
Princess
Princess
Elixir
Avg. Elixir
2.9
COPY DECK

Goblin Gang Hog Rage

Goblin Gang
Goblin Gang
Hog Rider
Hog Rider
Minion Horde
Minion Horde
The Log
The Log
Mortar
Mortar
P.E.K.K.A
P.E.K.K.A
Spear Goblins
Spear Goblins
Zap
Zap
Elixir
Avg. Elixir
3.6
COPY DECK

Fire Spirit Minions Rage

Fire Spirit
Fire Spirit
Minions
Minions
Archers
Archers
Knight
Knight
Mortar
Mortar
Musketeer
Musketeer
Rocket
Rocket
The Log
The Log
Elixir
Avg. Elixir
3.3
COPY DECK

Bats Miner Rage

Bats
Bats
Miner
Miner
Mortar
Mortar
Musketeer
Musketeer
Poison
Poison
Skeletons
Skeletons
Giant Snowball
Giant Snowball
Valkyrie
Valkyrie
Elixir
Avg. Elixir
3
COPY DECK

Ice Spirit X-Bow Rage

Ice Spirit
Ice Spirit
Skeletons
Skeletons
Tesla
Tesla
Mortar
Mortar
Bomb Tower
Bomb Tower
X-Bow
X-Bow
The Log
The Log
Earthquake
Earthquake
Elixir
Avg. Elixir
3.1
COPY DECK

Ice Spirit Miner Rage

Ice Spirit
Ice Spirit
Knight
Knight
Mortar
Mortar
Guards
Guards
Poison
Poison
The Log
The Log
Miner
Miner
Archer Queen
Archer Queen
Elixir
Avg. Elixir
3.1
COPY DECK

Bats Royal Ghost Rage

Bats
Bats
Royal Ghost
Royal Ghost
Goblin Gang
Goblin Gang
Minion Horde
Minion Horde
The Log
The Log
Miner
Miner
Mortar
Mortar
Zap
Zap
Elixir
Avg. Elixir
3
COPY DECK

Dart Goblin Phoenix Rage

Dart Goblin
Dart Goblin
Fireball
Fireball
Goblin Gang
Goblin Gang
Miner
Miner
Mortar
Mortar
Phoenix
Phoenix
Skeleton Army
Skeleton Army
Skeleton King
Skeleton King
Elixir
Avg. Elixir
3.5
COPY DECK

Archer Queen Bowler Rage

Archer Queen
Archer Queen
Barbarian Barrel
Barbarian Barrel
Bats
Bats
Bowler
Bowler
Earthquake
Earthquake
Mortar
Mortar
Skeletons
Skeletons
Valkyrie
Valkyrie
Elixir
Avg. Elixir
3.3
COPY DECK

Goblins Royal Recruits Rage

Goblins
Goblins
Minions
Minions
Arrows
Arrows
Mortar
Mortar
Miner
Miner
Royal Recruits
Royal Recruits
Skeleton Dragons
Skeleton Dragons
Goblin Demolisher
Goblin Demolisher
Elixir
Avg. Elixir
3.8
COPY DECK

The Mortar excels as used in the appropriate deck with cunning support and timing. Master this deck and rank up in ladder and challenges with ease.