Artorias the Abysswalker

Deeper Corruption - {b}{b}: Put a corruption counter
on Artorias the Abysswalker. Activate only once
each turn. Artorias the Abysswalker gets +1/+1
for each corruption counter on it. Depending
on the number of corruption counters on it,
Artorias the Abysswalker gains first strike (1),
double strike (2), manace (3), "whenever Artorias
the Abysswalker attacks, put two -1/-1 counter on
each creature defending player controls." (4)
"Soon... I will be consumed... by them, by the Dark"