What is cumulative upkeep?
Cumulative upkeep is an upkeep cost paid only during the permanent’s controller’s upkeep phase. During the first upkeep phase in which a card with cumulative upkeep is in play, pay the cost listed. During the second upkeep, pay twice the listed cost; during the third upkeep, pay three times the listed cost; and so on. If you cannot pay or choose not to pay the cost, the card is buried. The upkeep cost does not “reset” if control of the permanent changes. Q: Can I use Phantasmal Terrain to change a snow-covered land to a non-snow-covered land, or vice versa? A: No. Effects which change basic lands will not change whether a land is snow-covered. Spells with effects which only change a land’s type (such as Conversion, Gaea’s Liege, and Phantasmal Terrain) will not change whether a land is snow-covered.
