"Magic 2013", +m/without\spaying\s(its|their)\smana\scost/, +!cascade, +!cipher, +!rebound, +!ripple, +!suspend (3)
When Mindclaw Shaman enters, target opponent reveals their hand. You may cast an instant or sorcery spell from among those cards without paying its mana cost.
You may cast spells from your hand without paying their mana costs.
Exile target instant or sorcery card from your graveyard and target instant or sorcery card from an opponent's graveyard. Copy those cards. Cast the copies if able without paying their mana costs. Exile Spelltwine.
Gatherer works better in the Companion app!