Aragog

Reach, Trample, Haste, Vigilance

When Aragog enters the battlefield, return all spiders from graveyards to the battlefield under your control.
Each time a player draws a card, create a 1/1 spider token with Deathtouch and Reach.
Aragon's power and toughness are equal to X, where X is the number of spiders you control.

Convoke (All nonhuman creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)