Sinew Hulk

Mutate 2 (If this creature would untap during your untap step, you may instead put two +1/+1 counters on it.)
When Sinew Hulk mutates, you may sacrifice a creature. If you do, untap it.
The frontline of an invasion from Malacol, a defending army's worth is measured in how many hulks it can withstand before it is overwhelmed.