Unwanted Roommate

Defender.
When Unwanted Roommate enters the battlefield,
you may draw 4 cards. If you do, discard 2 cards.
Each turn, if an opponent loses one or more
creatures, make a token that is a copy of Unwanted Roommate.
Feed: At the beginning of your upkeep, you must
either sacrifice {x} food/drink tokens or mill {x} cards,
where {x} is the number of Unwanted Roommates under your control.