Swamp Amalgam

{1}{b}, {t}, sacrifice Swamp Amalgam: Put a +1/+1 counter on target creature you control with one
or more +1/+1 counters on it. Then, if that
creature has four or more +1/+1 counters on it,
put an additional +1/+1 counter on it.
Regenerate that creature.
Scavenge {1}{b} ({1}{b}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to
this card's power on target creature. Scavenge only as
a sorcery.)