Memento of the Fallen

Each time this upgrade is attached to a unit, it gains 1 counter. The upgraded unit has +1/+1 for each counter on this upgrade. When the upgraded unit is destroyed, you may move this upgrade to another friendly unit instead of wasting it. When you do, lose 1 health. If this upgrade would be wasted on the enemy�s turn, instead remove all counters and return the upgrade to your hand.