Letharon, tangling Avatar

Changeling (This card is every creature type at
all times.)
Mutagenic - At the beginning of each combat
phase, you may change power and toughness of
this creature.
As long Letharon's power is higher than 5 it get
menace. As long Letharon's toughness is higher
than 5 it get flying.
Partner with Morr