Kelrond the Warforger

Attached permanents you control have
"{t}: Add {r}."
Whenever you cast a spell, if at least 3 mana
spent to cast that spell was produced by nonland permanents you control, reveal the top card of
your library, if it's an equipment or fortification
you may play it without paying it's mana cost if
it's mana value is less than the amount of mana
spent to cast that spell. If not, draw a card.