Snowblind

Enchantment - Aura
Enchant creature <CR>
Enchanted creature gets -X/-Y. If that creature is attacking, X is the number of snow-covered lands defending player controls. Otherwise, X is the number of snow-covered lands its controller controls. Y is equal to X or to enchanted creature's toughness minus 1, whichever is smaller.

Enchantment - Aura
Enchant creature <CR>
Enchanted creature gets -X/-Y. If that creature is attacking, X is the number of snow lands defending player controls. Otherwise, X is the number of snow lands its controller controls. Y is equal to X or to enchanted creature's toughness minus 1, whichever is smaller.

Enchantment - Aura
Enchant creature <CR>
Enchanted creature gets -X/-X. If that creature is attacking, X is the number of snow-covered lands defending player controls. Otherwise, X is the number of snow-covered lands its controller controls. If this would reduce its toughness to less than 1, reduce its toughness to 1 instead.

Enchantment - Aura
Enchant creature <CR>
Enchanted creature gets -X/-Y. If that creature is attacking, X is the number of snow-covered lands defending player controls. Otherwise, X is the number of snow-covered lands its controller controls. Y is equal to X or to enchanted creature's toughness minus 1, whichever is smaller.