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Card Details
Cumulative upkeep 
At the beginning of your upkeep, choose a land type. This creature gains landwalk of the chosen type until end of turn.
“"We could feel the Shaman's power, as surely as we felt the storm." —Disa the Restless, journal entry”
2/2
Illustrated by Kaja Foglio
Rulings (3)
Nov 1, 2005
Can only give landwalk of land sub-types that exist (so you can no longer give "Island of Wak-Wak walk").
Nov 1, 2005
Can't give Snow landwalk, because Snow is supertype, not a subtype.
Oct 1, 2008
Paying cumulative upkeep is always optional. If it's not paid, the permanent with cumulative upkeep is sacrificed. Partial payments of the total cumulative upkeep cost can't be made. For example, if a permanent with "cumulative upkeep 
" has three age counters on it when its cumulative upkeep ability triggers, it gets another age counter and then its controller chooses to either pay 
or sacrifice the permanent.