Lady Amalthea

Lady Amalthea enters the battlefield with seven
Memory counters on it. At the beginning of your upkeep, remove a Memory counter from Lady Amalthea.
Lady Amalthea has indestructible as long as you control a creature named Prince Lir.
As long as there are no Memory counters on
Lady Amalthea, it is not a Unicorn and has
decayed.