I've built decks before with unintentional combos in them, and if you steal a way to copy spells and cast an extra-turn spell, you can go for it
We may end up with quite a few Squirrels, however, because if you thought I wasn't running Squirrel Nest and Earthcraft in this deck, you must be new
Usually you need an overwhelming board advantage, spot removal, big haste dorks or multiple haste dorks and/or burn spells to take her down
I ran into another mill deck that seemed to be testing the same strategy I was, but by replacing Space-Time Anomaly with Singularity Rupture doing double-duty as both a board wipe and a mill spell
Pure Taplands, though, don't
To do this, there is an amount of mana that has to be paid, which is explained on the front face of the card