Riveteers Overlook from your graveyard to the battlefield tapped.
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Riveteers Overlook enters the battlefield, triggering itself and
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Roaring Earth.
Resolve the
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Roaring Earth trigger, putting a +1/+1 counter on
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Cacophodon.
Resolve the
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Riveteers Overlook trigger, causing you to sacrifice it and search your library for a basic Mountain, Swamp or Forest and put it onto the battlefield tapped.
If you put a land onto the battlefield this way,
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Roaring Earth triggers, putting a +1/+1 counter on a creature you control.
Resolve the
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Scaretiller ability from step 1, dealing 1 damage to
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Cacophodon.
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Cacophodon triggers, untapping
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Scaretiller.
Repeat.
Results
Infinite +1/+1 counters on
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Cacophodon.
Infinite landfall triggers.
Put all basic Swamps, Forests, and Mountains from your library onto the battlefield.