Ghost-Lit Stalker [Duel Decks: Garruk vs. Liliana]

{4}{B}, {T}: Target player discards two cards. Activate this ability only any time you could cast a sorcery.
Channel — {5}{B}{B}, Discard Ghost-Lit Stalker: Target player discards four cards. Activate this ability only any time you could cast a sorcery.