Insatiable Gremlin

{r}, Sacrifice an artifact: Insatiable Gremlin
becomes a Gremlin Rogue with base power and
toughness 2/2.
{r}{r}, Sacrifice an artifact: If Insatiable Gremlin
is a Rogue, it becomes a Gremlin Warrior with
base power and toughness 4/4 and menace.
{r}{r}{r}{r}, Sacrifice an artifact: If Insatiable
Gremlin is a Warrior, put four +1/+1
counters on it and it gains trample.