Ariados

You may sacrifice a creature named Spinarak rather than pay this spells mana cost.
Ariados can't have -1/-1 counters placed on it.
Last strike.
Whenever Ariados blocks, it loses last strike and gains first strike until end of turn.
{b/g}, {t}: Target attacking or blocking creatures loses first strike and flying, gets -1/-0 and gains last strike until end of turn. If that creature is not both black and green or an artifact, put a