New Cards Review (V2.1):
Kobold:
It seems that it can exchange 1 for 1 and absorb some damage. However, when it is destroyed, The activation time of restrict-type trigger card should only have 2-3times left. Also, type of trigger card cannot be identified in Pro Mode so it is risky to use this card.
Sister Apprentice
Need to be destroyed as soon as possible in a battle in order to utilize its effect. Maybe useful in specialized deck with balance between number of this card and spell cards.
Lizardman
Magic attack and Ability Optimized are good combination for it to be Heavy Armor Striker. However, most common Heavy Armor units are Red Dragon, Dragon Slayer, Frost Wyrm. Their first attack is at 7/8s so Lizardman should be placed at the front or accompanied with Haste in order to optimize its value.
Tomb-raiding Girl
It is super strong if and only if 1v1 with epic card. However, it is difficult to attract attack from popular epic cards like Slayer and Godfather at the early stage of battle. It will set the upper limit of HP and ATK of deck if you want to.
Shadow Shield
Diamond/Trap/Hell Legion/CD6
Ability: When friendly Unit is attacked by enemy Unit with min ATK higher than 400. It will take 300 damage at most.
Long CD so it is less useful than Withstand. Just reduce damage so it is less useful than trap like Pit Trap. Except for Hell Legion, there is nothing special for this card.
Sexy Santa Girl
Acceptable attack point. Ability is “stealing 25% Max HP of the attacker”, can be applicable to common Unit Cards like Red Dragon, Nine-Tailed Fox, Dragon Slayer, Creator. Counter the AOE counter-Violet Maid. Many new strategies can be developed with this Girl.

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Imprison
An out-standing trap card when against two or more epic cards. HP deduction, 2cd and nature force faction have raise its value a lot. This card has also brought huge impact on traditional Epic-oriented gaming environment. Using epic cards is no longer riskless. Even you don’t use this card in battle, having one can also give you advantage (psychologically) when facing Epic players.

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Gathering Storm
Dealing huge HP reduction on single Unit. Even Creator will be one-shot kill. CD is a bit too long.

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