Playing Master of Evolution without a valid card to evolve to
If I play Master of Evolution which transforms a friendly minion to a random one that costs 1 more, but there isn't a valid minion in the game that costs that much, what will happen to my minion?
For example, if I use the Battlecry of this minion on a minion with a cost of 10, but there is no valid minion in the game with a mana cost of 11, what happens?
If there is no valid target, nothing will happen:
(Link)
The battlecry will do nothing if a valid minion does not exist with the appropriate mana cost.