Spiralling Siphonophore

Flash, morph {2}{b}
When Spiralling Siphonophore enters the battlefield, it gains first strike until end of turn.
When Spiralling Siphonophore attacks, it gets
-2/-0 until end of turn. Tap and exert it.
When Spiralling Siphonophore blocks a creature,
that creature gets -2/-2 until end of turn.