Night Wyvern

The controller of this card must flip a coin
before each battle phase. If the result is heads
this card gains flying and indestructible. If it is
tails it loses half it's power and toughness and
must attack if able.
{r}{r}{r}{r}{b}{b}{b}{b}:
Select and destroy one creature on the field. This
creature's power is doubled for that turn.