Arren, Arbiter of the Gods

Whenever you gain life, put that many soul
counters on Arren, Arbiter of the Gods.
Remove 2 or 4 soul counters from Arren, Arbiter
of the Gods, choose the first or the second:
• Each player loses 1 life.
• Reveal the top card of your library and put it
into your hand. You lose life equal to half its
converted mana cost rounded up.
"Only life pays for life."