Dravic, Draconic Devilry

Insidious - {b}{r}, Discard two cards
Haste, skulk, double Strike
When Dravic enters the battlefield or deals
combat damage to a player, you may cast target instant or sorcery spell for any graveyard without paying their mana cost. If Dravic was cast from
exile, you may cast up to three target instant or sorcery spells for any graveyard without paying
their mana cost.