Aragog, King Arachnid

Reach
During your end step, create a black and green
0/0 Spider creature token with Reach and
"When this creature enters the battlefield, place
X 1/1 counters on it, where X is the number of
Spider creatures you control."
"The giant talking spider, who dwelled deep within the Forbidden Forest and which Harry and Ron has only narrowly escaped four years previously."