Form of the Progenitors

Trespass {u}{b} (You may cast this spell for its
trespass cost. If you do, flip a coin and call it. If you
lose the flip, Form of the Progenitors becomes
dangerous.)
If Form of the Progenitors is dangerous, target
creatures controller sacrifices it. Until the end
of turn, that creature becomes a blue and black
Dragon with base power and toughness of 5/5,
and gains flying, haste and hexproof.