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The format is pretty saturated in this area, but I have to give props to WotC for giving us a new one to work with that comes with an interesting angle

Flood counters are simply used to demark which land had its type changed

Once a creature resolves it stays on the battlefield until destroyed, exiled, or bounced

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For traditional ramp, all the generic good stuff is good here: Sol Ring, Wayfarer's Bauble, Mind Stone, these are great in any Mono Black deck and this one is no exception

If you've got money to spend and want to really show off, though, there are some printings of basic lands that discerning collectors will instantly recognize as rare and valuable