Alexis, Soothsayer Hermit

When Alexis, Soothsayer Hermit enters the battlefield all players must choose a creature they control and put a fate counter on it.
It's controller must note these cards in an order he chooses and keep that order hidden.
When a creature with a fate counter on it dies, put a +1/+1 counter on Alexis, Soothsayer Hermit.
If those creatures die in the chosen hidden order, transform Alexis, Soothsayer Hermit;

10/10 with Flying, Hexproof & Indestructible