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Lair of the Ashen Idol Plane: Azgol At the beginning of your upkeep, sacrifice a creature

The purple coloring is a nice effect, and gives the art a real sense of movement

Niv-Mizzet, Visionary liberates you from hand size restraints and draws you cards for dealing damage to your opponents

Magic: The Gathering Online (Press release)

Pretty circular design that can feed itself, though its second ability is more akin to Populate

What you cannot do is rely on them to provide that influx of cards, if you know you really want to fill up the hand and you are running out of slots then perhaps these walkers are not the best option