Bell Borca, Spectral Sergeant

You'll still pay all costs for a spell cast this way, including additional costs. You may also pay alternative costs if any are available.

If a card in exile has {X} in its mana cost, X is considered to be 0.

You must follow the normal timing permissions and restrictions for the card exiled by Bell Borca's last ability. If it's a land, you can't play it unless you have land plays available.