If you are using malric (3 mana summoner card), cerberus (4), kobold miner(2), serpentine spy(3) which brings the total cost to 12. You can use this combo it will work fine but 1 mana is left out and you don't have any 1 mana cards in your starter deck. You can put any of the below mentioned cards either by buying or renting them.
1 - Flame Monkey - Last in the lineup so sneak monsters can waste their attack on this card.
2 - Creeping Ooze - Reducing the speed of opponents. If opposition has not got a creeping ooze in the their deck is same as yours free victory. You can keep this card in the second position behind cerberus and next will be sepentine followed by kobold if your strategy is to keep the monsters speed down for a long time.
Else keep it in last position to sacrifice your card and get speed benefit and protect the other monsters.
3 - Furious Chicken - 0 mana card chances of winning just spikes up as this card will be sacrificed either at first position or at last position or if you keep in the middle before serpentine spy opponent will have to get rid of chicken first. Fills in space as a zero mana card always helpful. Can be used in combination with flame monkey or creeping ooze or aganju.
4 - Aganju - The best 1 mana card to be kept on second position as it has reach ability an additional damage. Super powerful in low mana matches. Very expensive to buy or rent.