Fetid Birchwood

When Fetid Birchwood enters the battlefield,
target opponent may look at the top three cards
of your library and put them back in any order.
{t}: Add {w}, {b}, or {g} to your mana pool. Fetid Birchwood deals 1 damage to you.
"No longer deep enough for our canoe we continued on
foot, each step, sinking deeper into the muskeg."
—Anaq Yanye, leader of the Ekap Merchants