Ice Age

Snowfall

Cumulative Upkeep: o
U
Islands may produce an additional o
U when tapped for mana. This mana is usable only for cumulative upkeep.
Snow-covered islands may produce either an additional o
Uo
U or an additional o
U when tapped for mana. This mana is usable only for cumulative upkeep.

Cumulative upkeep {U} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Whenever an Island is tapped for mana, its controller may add an additional {U}. If that Island is snow, its controller may add an additional {U}{U} instead. Spend this mana only to pay cumulative upkeep costs.