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(6 replies, posted in Decks and Deckbuilding)

Decree of Pain can destroy all creatures, or give them -2/-2 until end of turn.
Extinction destroys all creatures of a type.  Bye bye plants!  Tsabo's Decree has the same effect, plus a bonus.
Forced March is a great way to get rid of tokens.
You can build up a lot of mana in mono-black, so In Garruk's Wake, Plague Wind and Overwhelming Forces should be usable.
Pestilence effects are a great way to clear a board - try Pestilence, Crypt Rats, Thrashing Wumpus, Pestilence Demon...Toxic Deluge will help as well.

Also, just a note - the tokens from the Guildmage don't grow from Avenger of Zendikar's landfall ability.  The Guildmage makes Saprolings, and Avenger of Zendikar only boosts Plant creatures.

I have a large tradelist, also more than a playset of duals and ABU/AQ/AN/LG legacy bombs in my inventory. Willing to move some for Pod staples and EDH staples reflected in my wishlist.