Potentially you could cast Venerated Loxodon for one white mana, and put four +1/+1 counters on four creatures that helped you cast it. This means that Modern token-based decks may have found a new lord.
Guilds of Ravnica brought some very good token-generating cards in these two colors, such as March of the Multitudes, Emmara, and Ledev Champion. Combine them with a few old staples, such as Voice of Resurgence and Tendershoot Dryad, and you will have some really powerful things happening on your side of the board.
If you like to include some removal in your deck as well, then black-white variant may fit your playstyle better with such cards like Hanweir Militia Captain, Squadron Hawk and Lingering Souls.
That is all on the 9 best Guilds of Ravnica cards for Modern format, and for other Magic: The Gathering guides at GameSkinny, check out the list below: