Crimtane Ferrum

Vigilance, Trample

Spells you cast cost {1} less to cast for each color among permanents you control.

Whenever Crimtane Ferrum deals combat damage
to a player, you may search your library and/or graveyard for a dragon creature card and put in exile. You may cast spells exiled with Crimtane Ferrum and you may spend mana as though if it
were any color to cast it.