Abomobeast

Trample
If it is snowing outside, you may spend white mana as though it were mana of any color to cast Abomobeast.
If it is snowing outside,Abomobeast has shroud and all lands are snow lands.
{s}, {t}: Throw target snowball, if you hit a player, tap target permanent that player controls.
Isn't always snowing outside somewhere?