Infection Shard is a Spell Card released in the September 25th, 2013 Update. It deals only 1 Damage, but if it manages to kill a Creature, it gains the powers of a Zombie; The killed Creature becomes a new Zombie under your control.
Type: Spell Card
Ability 1: 1 Damage
Ability 2: If this spell kills a Creature, it becomes a 1/1/1 Zombie under your control.