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1 Bane of the Living

(Skyshroud Elf can turn anything to red or white, for example.) And this is just the first combo that comes to mind

Costing four generic, one blue, two black, and one red, and with a starting loyalty of five, this card hits the board and makes an immediate impact

Karrthus, Who Rains Fire From The Sky

The second starts down two cards and three life but your lands tap for 2 mana so you'll get a 2-drop on turn one, a four-drop on turn two, and Kokusho the Broken Star on turn three

A lot of green decks are going to find ways to modify creatures (using the definition of the mechanic modify, of course), but in a pinch you can use Silkguard to modify them anyway