Shaman

Adventurer
{3}{b/g}: Until end of turn Shaman becomes one of the following:
A rat with base power and toughness 1/3 and
"When this creature attacks create a food token"
A spider with reach and base power and toughness
2/3
A troll with base power and toughness 3/5
An imp with flying, base power and toughness 3/3
and "instant and sorcery spells you cast cost {1} less
to cast"