Few useful common cards.

GOBLIN MECH

At level 6 this monster has a few abilities: Piercing and Stun. It also has good health, armor and attack power.

SEA MONSTER

This monster has good health and attack power. It has healing ability and gains Thorns ability at level 6.

NECTAR QUEEN

This monster has good attack power, great health and flying ability. At level 6 it gains Retaliate ability. At level 10 it gains Poison ability.

SAND WORM

This monster has great attack power and sneak ability. It also gains Snare and piercing abilities at levels 6 and 10.

RIFTWING

This monster is good for low mana matches because it has flying and scavenger abilities. It gains backfire at level 5 and Headwinds at level 8.

GOBLIN PSYCHIC

It has a nice health and magic attack. It also starts with tank heal and gains Affliction at level 4, Silence at level 7 and Dispel at level 10.