Cerberus is the best 4 mana monster to use at little game mode because of the high health and healing ability. Another pros of this card are high speed, retaliate ability to revenge from the attacker, 4 melee attack and 5 if used with fire summoner. Best effective game modes to use this card are standart battle, sneak attack mode, a mode where all melee monsters can attack from any position, a mode where only melee monsters can be used.
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From @zen21