...couldn't they just errata Leovold?

So... this is something I have wondered for a while. Leovold's 'one card a turn' limit is actually a really powerful effect we need more of in EDH, but because of wheels it is too easily abused. But what if it... wasn't?

A simple errata is all it would take. A simple line stating that these effects only applies to effects THAT player controls.

This way, if I have Leovold out your own spells and abilities cannot cause you to draw more, but if something another player does causes you to draw cards, no limitation.