Solgard, the Martyr

Solgard, the Martyr is not a creature while it has
less than 4 shard counters on it.
Whenever you cast an instant or sorcery spell,
put a shard counter on Solgard, the Martyr.
{2}{u}-Solgard, the Martyr deals X damage to
target creature, where X is the number of shard
counters on this card. Remove one shard counter
from Solgard, the Martyr.