Wonders of Eras Past

Wonders of Eras Past costs {1} less to cast for each Elemental in your graveyard.
Return all Elementals from your graveyard to the
battlefield. For each permanent returned this way,
destroy target land. Then, exile Wonders of Eras
Past.
{1}{g}{g}, Reveal Wonders of Eras Past from
your hand: Search your library for an Elemental
creature card, and put it into your graveyard.
Target land you control gains the abilities of that
card and is a 1/1 Elemental creature this turn.