Immortal Lotus

When Immortal Lotus comes into play, sacrifice
a Legendary permanent.
Immortal Lotus stores all unconsumed mana in
the game.
{t} Add one mana of any colour stored in
Immortal Lotus to your mana pool.
{t} Sacrifice Immortal Lotus, return target
Legendary permanent from your graveyard to
your library, third from the top.