Nai, the Phantom Limb

Nai can block an additional creature each combat
for each +1/+1 counter on him.
Whenever you draw or discard a card, put a
+1/+1 counter on Nai.
{4}{u}{u}, {t}: Draw two cards, then discard a card.
Partner with Hikari, the Fireblooded and
Hakuryu, the Freezeshock