Dungeon of the Naga

Whenever a creature attacks you or a
planeswalker you control, it gets -1/-1 for each
other attacking creature.
{4}{u}{b}, exile a creature card from your
graveyard: Create a black and blue 4/4 naga
creature token with drown 2 (When this creature
deals combat damage to a player or planeswalker you
may sacrifice it. If you do, draw 2 cards.)