At the beginning of your upkeep, you may mill two cards.
Whenever one or more land cards are put into your graveyard from anywhere for the first time each turn, create a 1/1 green Insect creature token.
Christopher Moeller INTERVIEW
If multiple land cards are put into your graveyard at once, Crawling Sensationâ€™s last ability triggers only once. This could happen because an effect (such as that of Crawling Sensationâ€™s first ability) put them there from your library at once, or because they were destroyed at the same time (such as two land creatures that were dealt lethal combat damage).