Merchant of Secrets

When Merchant of Secrets enters, draw a card.

Concentrate

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Lightning Blast deals 4 damage to any target.

{4}, {T}, Sacrifice a creature: Fodder Cannon deals 4 damage to target creature.

Pyroclasm deals 2 damage to each creature.

Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles.

Searing Wind deals 10 damage to any target.

Pyrotechnics deals 4 damage divided as you choose among any number of targets.

{T}: Orcish Artillery deals 2 damage to any target and 3 damage to you.

Return target creature to its owner's hand.

Destroy target nonblack creature. It can't be regenerated.

Urborg Volcano enters tapped.
{T}: Add {B} or {R}.

Enchant permanent
You control enchanted permanent.

Return all creatures to their owners' hands.

Volcanic Hammer deals 3 damage to any target.