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A better version of Katabatic Winds that keeps the flavor would be cool. Or, a different idea and flavor but a similar effect on flyers.

Green should get in on the knowledge-testing train of Legacy "name a card" cards like Cabal Therapy, Meddling Mage, Nevermore, Runed Halo, Slaughter Games, Phyrexian Revoker and Pithing Needle.
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Contaminated Goblin Cart :1::r:
Creature - Goblin
Whenever you're dealt damage, sacrifice Contaminated Goblin Cart unless you sacrifice a Goblin.
If a land is tapped for mana, it produces :r:...