Jiggy, Silly Little Guy

When Jiggy, Silly Little Guy enters or leaves
the battlefield you may cast a sorcery who’s
mana value is equal to this creatures
toughness, without paying the cost.

{x}{g/u}{t}This creature gets +0/+{x}
until your next upkeep. If you activated this effect as
a sorcery at the beginning of your next end step, Jiggy, Silly Little Guy is destroyed.