The Deku Tree, Forest Deity

Defender
Other Elves, Treefolk, and Druids you control have +1/+1 and Hexproof.
This creature’s toughness is equal to the number of forests you control.
Landfall—Whenever a land enters the battlefield under your control, you may search your library or graveyard for The Master Sword or another Treefolk and put it in your hand.
{t}: Add {g} or {w} to your mana pool.