Caterpie

{p/g}: Monstrosity 1 (Activate this ability only
when you could cast a sorcery. Give this creature one
+1/+1 counter, this ability may only be used twice)
Creatures that are dealt damage by Caterpie
don't untap until their controllers next untap
step.
Caterpie gains Wither after you cast it's first Monstrosity, then gains Flying after the second
cast.