Mathmech Nabla

{p/b}, sacrifice a cyberse creature: search you library
for a creature with "mathmech" in it's name, put it
in the battlefield. Only activate once each turn.

If this card is put into the graveyard you may chose
a spell with extrazone in the battlefield, it gains " If this creature was blocked, at the end of combat you may start another combat phase if tapped untap it. Only this card can attack. Activate only once this turn ", until the end of your turn. Only activate
once each turn.