Documented Exploration

Whenever a nontoken creature enters the battlefield that doesn't have the same name as
another card on the battlefield, in graveyards, or
in exile, put a classification counter on it.
Whenever a creature with a classification counter
on it dies, you lose life equal to that creature's converted mana cost.
At the beginning of your upkeep, you gain life
and draw cards equal to the number of
permanents you control with classification
counters on them.