Khyzox, Stormsworn Magus

Haste, ward {2}
Khyzox, Stormsworn Magus enters the battlefield
with two +1/+1 counters.
Whenever Khyzox, Stormsworn Magus attacks,
choose one-
•Double the number of counters on target
creature you control.
•Add X mana in any combination of colors to your
mana pool, where X is the amount of counters on target creature you control.