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We also have the benefit of all the shocklands in Standard that makes the possibility of a three- or four-color deck more reasonable (and Chromatic Lantern if you really want to be nutty and do all five colors)

And are those three cards strong enough to make the core of a Pioneer deck

Craft: Immediately Copies: 4 each Murderous Rider performed as expected for me

You also get to use this effect whenever you play this card or whenever it quests

The best ones in this kind of build are the ones with powerful enter the battlefield abilities, like Terror of the Peaks

If you prefer to keep a general around you can always use Prison Term, which has the added advantage of being able to shift around when bigger threats hit the battlefield