Vast Tomb Network

Vast tomb network costs {1} less to cast per black
creature you control.
Creatures are not affected by vast tomb network
if they meet at least 1 of the following: are black,
are a rat, are an insect, are an ooze, are a rogue,
are a spirit, are a spectre, are a vampire, are a
zombie, have flying, have swampwalk.
All creatures that attack you gain -2/-0 and lose
trample until end of turn.
"Plenty of crawlspace."