Xor, Madness Feeder

Trample
Whenever a creature dies, each player discards a
card at random. Then, each player loses X life,
where X is the total number of cards in that
player's graveyard with the same name as the discarded card. For each player for which X is 2
or more, put a +1/+1 counter on Xor.
{u}{b}{g}: Each player sacrifices a creature.