Alexandria, Cleansed in Oil

Hexproof, Haste, Infect
Alexandria, Cleansed in Oil does not untap on your untap step.
{p/b}{p/r}{p/u}{p/w}: Untap Alexandria, Cleansed in Oil
{t}, Sacrifice an artifact: Create X 1/1 colorless Thopter creature tokens with flying, where X is the sacrificed artifact's mana value
At the beginning of your upkeep, if you control 50 or more artifacts, you win the game