The Hanging Gardens

Whenever a legendary creature enters the
battlefield under your control put a lore counter
on The Hanging Gardens. Legendary creatures
you control get +1/+1 for each lore counter on
The Hanging Gardens.
When The Hanging Gardens is put into a
graveyard from the battlefield, non-legendary
creatures get -X/-X until end of turn where X
is the number of lore counters on The
Hanging Gardens.