Decay, Spreader of Fungus

This card costs {1} less for each fungus
creature on the battlefield and in your
graveyard .
Wither (This creature deals damage to other
creatures in the form -1/-1 counters.)
Rot * (Place * -1/-1 counters on target creature
when this creature is put into a graveyard from
anywhere.)
* is equal to the number of fungus creature
on the battlefield under your control.