Solus, Niv-Mizzet's Page

{2}{r}, {t}: Reveal the top card of your library. Draw that card. If it was a Dragon, draw an additional card.
{x}{u}, {t}: Deal X damage to target creature, player or planeswalker, where X is equal to
the number of dragons you control.
Whenever you play a Dragon spell, all other Dragon spells you cast this turn cost {2} less.