Lolth, the Queen of Spiders

Indestructible
{b}When Lolth enters the field, all elves take -4/4 and all drow get +4/4 for the rest of the game.
{b}When Lolth is being played, all spiders can only attack allies.
"She sits in the Demonweb Pits, plotting the demise of every elf in the multiverse."