Memento of the Fallen

Each time this upgrade is attached to a unit, place a +1/+1 counter on it.

The upgraded unit has additional attack and health equal to the number of counters on this upgrade.

When the upgraded unit is destroyed, you may move this upgrade to another friendly unit instead of wasting it.

If this upgrade would be wasted on the enemy’s turn, instead remove all counters and return the upgrade to your hand.