Kyrim, Whisper of Silence

If you control a web, spiders you control have
reach and can block any number of creatures.
At the beggining of your end step, create a
0/4 wall token with reach named Web.
Any creature blocked by a Web you control
doesn't untap during its controller's next untap
step.
At the beggining of your upkeep, choose target
tapped creature. Destroy that creature and create
X 1/1 black and green Spider tokens.