Omnath, Conduit of Mana gets +1/+1 for each mana you have.

If you would lose unspent mana, if it isn't the cleanup step, that mana becomes the color of your choice instead, then you add that much mana of a different color of your choice. This mana can't be used to cast spells or activate abilities of sources other than Omnath, Conduit of Mana.

{10}: Scry 1.