Snowblind

[Upinthe]

Snowblind
Card Set:  Ice Age 
Casting Cost: 3G
Color: Green
Spell Type: Enchant Creature 
Rarity: Rare
Artist: Douglas Shuler
 
Original Rules Text:
Target creature gets -*/-*. When that creature attacks, * is equal to the number of snow-covered lands defending player controls. At other times, * is equal to the number of snow-covered lands its controller controls. If this reduces the creature's toughness to less than 1, the creature's toughness is 1. 
 
Current Rules Text:
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. 

Can someone please explain to me how this interacts with other cards that subtract toughness?

[diopter]

The current Oracle text is actually like this:

Snowblind
3G
Enchantment - Aura
Enchant creature
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.

[Apollyon]

It applies after stuff like Sudden Death, Darkblast, -1/-1 counters, etc.

If it's affected by an enchantment that modifies its power/toughess without setting it to a value, it is applied in timestamp order.

If it's affected by power/toughness switching, apply that last.