Its possible to create an infinite loop with Jan Jansen, Chaos Crafter if you have Clock of Omens and have a way to make Jan Jansen into an artifact, something like Liquimetal Torque or Liquimetal Coating
Bleachbone Verge Bleachbone Verge is often a land subtype away from a Scrubland, and black and white decks often have no trouble putting plains or swamps into play, so the main drawback is the lack of searchability for this verge
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The rate is reasonable and then you get an attack boost to your entire board for four turns in a row
Its casting cost is less restrictive, it can go in a wider range of decks, and it doesnt have flying, so it dodges one type of removal (albeit not the most popular)