Alxom, Alpha Fallen Regent

Flying, Trample, Protection from Blue and Black.
When you discard a card, draw a card and put
+1/+1 counter on Alxom.
{u}{b}, {x}, {t}: Discard X cards and deal X damage
to target Dragon you control. If you do, Alxom's
base power and toughness becomes equal to the targeted Dragon's.