I'm not sure you even need the dry ice. Burning a candle in the terrarium until it snuffs itself out will remove most of the oxygen. However, keeping plants in such an oxygen-starved environment indefinitely will kill them. Plants do need some oxygen readily available for respiration, they just don't die as quickly without it. And yes I'm fully aware that they do produce O2.
I did an experiment when younger of putting a candle in a sealed terrarium and letting it burn out. The plants were dead by the next week. I bet if I ventilated it within a day or 2 they would have flourished instead.
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