The Plant Kìng
the Plant King
was cancelled due to not fitting well within League of Legends
On the map for the 2010 Harrowing, a coffin can be seen on the extreme lower right with him in it. This could be the subtle "nail-in-the-coffin" confirming his cancellation.
Although no official statement was given on the Plant King, here are some in-game pictures thought to be part of his abilities
Thorns (possibly the innate)