Xa-Thi, the Walking Hive

Insects you control have Wither.
(This creature deals damage to creatures
in the form of -1/-1 counters.)
Xa-Thi enters the battlefield with X +1/+1
counters on it, where X is equal to twice the
command tax paid for Xa-Thi.
When Xa-Thi dies, create X 1/1 black and green
Insect creature tokens, where X is equal to
Xa-Thi's toughness.