Omnath, Locus of Cycles

When Omnath enters the battlefield, draw a card.
Landfall — whenever Omnath or another land
enters the battlefield, its controller adds one
mana of any color to their mana pool.
If a player would lose unspent mana, that mana
moves to the next player in turn order. (mana
leaves your mana pool at the end of the draw step, the
end of each main phase, the end of combat
and the end of turn)