Arachnid Ancestor Idmon

Defender, first strike, shroud
{2}{b}{g}, {t}, Sacrifice a creature: Put X +1/+1 counters on Arachnid Ancestor Idmon, where X is the sacrificed creature's toughness. This creature loses defender and gains trample if it has ten or more +1/+1 counters on it.
{5}{b}{g}, {t}: Gain control of target creature. It's a Spider in addition to its other types.