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Planar Cleansing threatens to see sideboard play sometimes, but it has never gone higher than $1.50 or so

Proliferate is flavored as a Phyrexian mechanic, so it has a home in lots of Phyrexian-themed decks

Sadly, the powerful ability can only trigger once per turn

If I do this I'll draw X cards and then put X land cards from my hand onto the battlefield tapped where X is the sacrificed creature's power

The most common one for Modern was getting Borborygmos Enraged into play and killing your opponent by discarding lands

In practice, this means waiting a little until you have lands in play and a game plan, and it means building your deck with recursion in mind