A'rik, Forest of the Forgotten

A'rik, Forest of the Forgotten enters the
battlefield tapped.
{t}: Add {g}{u}{u}.
{3}, {g}{u}, Sacrifice A'rik, Forest of the Forgotten:
Target opponent loses 5 life and exiles all lands
and creatures with mana abilities they control.
You gain life equal to the number of cards
exiled this way.