Archery This spell deals 5 damage to target creature with flying
As is, its one of the best sac outlets in Magic, to the point of being broken
You won't see much milling going on in white MTG decks, but black, green, and occasionally red see a mill card or two
The most likely reasons are if it's sacrificed, if it's legendary and another legendary permanent with the same name is controlled by the same player, if it's a planeswalker and another planeswalker with the same subtype is controlled by the same player, if it's a creature with toughness 0 or less, or if it's an Aura that's either unattached or attached to something illegal
In the face of high Willpower six, seven, and eight-cost cards, this deck has very few answers
The red Season can ramp and draw. And the green Season can wipe out artifacts and enchantments