Echoes of Childhood

When this card enters the battlefield put
4 Memory counters on it.
Whenever a creature leaves the battlefield,
remove one Memory counter.When all Memory counters are removed, transform Echoes of
Childhood into Allestor, Protective Guide.
{5}Remove one Memory counter.
"He was just my imaginary friend from childhood . . .
but it was all just a game, he couldn't have been real
. . . could it?"