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.