Glassland

{t}: Add {c}.
{t}, Sacrifice a creature or artifact: Target creature
or artifact gains indestructible until the end of this
turn.
{t}, Sacrifice Glassland: Search your library for a
creature or artifact card, put the card onto the battlefield, then shuffle your library. Pay that card's
mana cost during your next upkeep or exile it.

"It's infinite...until you reach the end"