Shamgar, Judge of Israel

-3: After reducing, put a loyalty counter on this planeswalker for each creature in each of your opponents graveyards divided by 3 round down.
-X: Deal 1 damage to X target creatures. If X is even, you may instead deal 2 damage to half X target creatures.
-7: Choose two: Exile target creature, deal 3 damage to each creature target player controls or deal 5 damage to three target creatures.