Ziogdeth, the Epidemic

Emerge {2}{u}{u}{b}{b}{g}{g}
Trample, hexproof
When you cast this spell, germ creatures you control get +X/+X until the end of turn, where X is the number of Germ creatures you control.
At the beginning of your upkeep, target creature gets -X/-X, where X is the number of Germ creatures you control.