Beginner Strategy For 12 Mana

I recommend Malric Inferno and Pyre for low Mana.

For monsters,
Ceberus for first postion, Serpentine Spy for second position and Kobold Miner for third position.

Since Ceberus can restore its health and 2 attack, it has good durability and attack. Therefore, it is not only good for tank, but also as an attacker.

Nevertheless, Serpentine Spy has opportunity ability and has 3 speed and 2 attack that can easily assasinate the monsters from anywhere who has low health.

Also, Kobold Miner has sneak ability that can target the monster from last position.

The combo of Kobold Miner and Serpentine Spy is my favorite that Kobold can make the monster weak and Sperpentine can assasinate the weak monster. Nevertheless, since Serpentine Spy can assasinate the low health monster from anywhere, it can help the Ceberus to kill the first postion monster.

If you decide to use Makric Inferno, the summoner can make them more stronger in attacking, it can give more damage to your enemy.
If you decide to use Pyre, the summore can promote their speed and you can finish your enemy faster and easily.

Hope this guide can help you,
If you are new to Splinterlands,
here is my referal link - https://splinterlands.com?ref=hachiken
Thanks For Your Attention.