Hmmm. Every mechanic has a color that it gets defined in. But each mechanic also tends to have a "second-best" color. Card draw, for example, is blue, but is second best in green. Trample, well....black? It's hard to tell. Black or red. Remember red had a cycle of beasts back in the day (though, yes, not many had trample). I do know white and blue don't have a lick of it, so it goes to one of those.