The Great Arachnid Invasion

When The Great Arachnid Invasion enters the battlefield, create X Spider token creatures where
X is the number of enchantments and artifacts
you have on the battlefield. If when The Great
Arachnid Invasion entered the battlefield your opponent controlled an enchantment, they create
1 Human Warrior token creature.
As long as The Great Arachnid Invasion is in
play, all +1/+1, +1/+0, and +0/+1 counters get
turned to -1/-1, -1/-0, and -0/-1 counters.