The final picture is the important one
As a bonus, there's a good chance all that Snow mana you pour into Blood on the Snow will revive one of your own fallen troops
In a typical White deck, if I'm looking for unconditional board wipes I'd be reaching for Wrath of God, Day of Judgment, Austere Command, Fumigate, and others before I consider adding Shatter the Sky
I really love the common Orbs of Dragonkind, which nicely help ramp us towards our more expensive Dragons while providing a nice bonus effect for Dragon spells particularlyred provides haste, blue lets you scry, and the green one makes your Dragon a bit bigger and gives it hexproof until your next turn, making it more likely to avoid pinpoint removal for a while
Leyline of Sanctity protects us from targeted discard or burn spells that can disrupt our hand or kill us