Knowledge of Flame

Non-red instants and sorceries you cast may be paid with red mana instead of their usual colors, but cost {r} more to cast if you do.
At the beginning of your upkeep, pay {r}{r} or sacrifice Knowledge of Flame.
{r}{r}{r}{r}{r}{r}{r}: Return Knowledge of Flame to the battlefield from the graveyard. Costs {r} less for each red spell played this turn.