Titania, Voice of Gaea

Reach
Whenever one or more land cards are put into your graveyard from anywhere, you gain 2 life.
At the beginning of your upkeep, if there are four or
more land cards in your graveyard and you both own
and control Titania, Voice of Gaea and a land named Argoth, Sanctum of Nature, exile them, then meld
them into Titania, Gaea Incarnate.