This is a low mana match battle, IMO death splinter has pretty good options of low mana monsters. When playing in low mana match, most likely we will be facing low mana monster as well, which is also come with low HP, and Thaddius Brood -1 HP ability will turn them even lower. And -1 magic attack could also counter magic deck efficiently in case opponent use it.

The best choice of low mana tanker in death splinter. Only require 1 mana but provided 4 HP, one of the most efficient tanker in low mana battle. Definitely buying enough time for back liner to attack.

A monster with free mana cost, it's always good to fill up the empty position, you will never know what surprise could they provide, even it's just 1 Attack and 1 HP. Free tank for back liner to deal damage as well.

In low mana cost battle, Venari Bonesmith with the ability LIFE LEECH make him a very good option to enter battle. The problem of low mana card is low HP, but LIFE LEECH has solve this problem. This ability is as good as heal, but could add up on MAX hp. While reaching the turn for Venari Bonesmith to go for tanker position, that's chances that he has already accumulated a considerable amount of HP if he is untouched from attack like SNIPE. In short, a monster that could deal damage and tank relatively good in low mana cost match.

Exactly the same reason why I had chosen Venari Bonesmith, for the ability of LIFE LEECH, playing the same attacker role and tanker if necessary. The reason he is place behind Venari Bonesmith is because he is having lower HP, always put the monster with higher HP in front to tank longer and buy time for the back lane.

Protagonist of the week! I have 3 mana left, so I chosen Soul Strangler. Soul Strangler provide very good attack with the cost of 3. But he has very weak HP, so I put him in 5th position instead of last to avoid SNEAK attack.

With the cost of 4, Dark Astronomer provided very good attack and HP. 4 HP is decent enough to tank SNEAK attack in the last position for a low mana cost battle.