Kilastar Deathrider

Haste, decay (This creature takes damage in the
form of -1/-1 counters.)
Kilastar Deathrider can't attack as long
as it has a -1/-1 counter on it.
{b}: Remove all -1/-1 counters from Kilastar Deathrider. It gets -0/-X until end of turn,
where X is equal to the number of -1/-1 counters on it.