Asvin, Druid of the Moon

Whenever Asvin, Druid of the Moon deals
combat damage to a player, draw that many cards.
{1}{g}: Asvin becomes a 1/1 green snake with deathtouch and unblockable until end of turn.
{2}{u}: Asvin becomes a 2/3 blue bird with flying
and hexproof.
{3}{g}{g/u}{g/u}: Asvin becomes a 5/5 green and
blue bear with trample and first strike