Hatman

When this creature enters the battlefield,
each player flips a coin. On heads, they discard
two cards. On tails, they lose 5 life. If a player
must discard but has no cards in their hand,
they discard the top two cards of their library.
This creature gains one +1/+1 counter for each
card discarded.
When this creature leaves the battlefield, you
gain life equal to its power.