Ham, the Tickery Man

Whenever you cast an instant or sorcery
spell you may have Ham, the Tickery Man
become any of the following, until end of
turn:
• a 5/5 Dragon with flying
• a 1/1 Human with hexproof
• a 3/1 Illusion with unblockable
{bull} a 1/1 Spirit with indestructible