Marjorie, Raid Expert

{3}: Marjorie, Raid Expert gets -1/-0 and gains
unblockable.
Whenever Marjorie, Raid Expert deals combat
damage to a player, put a raid counter on
Marjorie, Raid Expert.
Whenever Marjorie, Raid Expert attacks, gets
+X/+0 and each creature defending player
controls gets -Y/-0, except Y is halved rounded
down for each raid counter on Marjorie, Raid
Expert.