Mangnomel, light of progress

As an additional cost to cast Mangnomel, light of progress, reveal a Gnome card from your hand or discard a card.
{t}: Add one mana of any color to your mana pool. Spend this mana only to cast Gnome spells. You
lose 1 life.
{g}{w}{b}{u}{r}: Mangnomel, light of progress becomes a 5/5 Gnome Angel with first strike, flying, trample, lifelink and vigilance.