Forgotten Ruin

At the beginning of your upkeep, put the top
card of your library on the bottom of your deck.
{t}, Pay 1 life: Add one mana of any color
to your mana pool.
{4}, {t}: Search your library for a legendary card, shuffle your library then put it on the top.
"The epitaph that marks those who once dwelled in these weathered bones of mortar and stone."