The +2 can only net you a Mountain, and the -3 is dependent on the number of Mountains you can control
Also, watch out for trap cards like Righteous Authority , it might just be a personal bias but the mana it costs isnt worth the extra card per turn and there are nicer options for card draw like any of the enchantresses for synergy or even just a Kumena's Awakening quadmiller7 on azourious 7 years ago +3 Jace, Architect of Thought @ 1.59, +2 Nimble Obstructionist @ 2.45, +3 Dungeon Geists @ 0.49 +2 Irrigated Farmland @ 0.79, +1 Cast Out @ 0.25 = 12.97 -1 Righteous Authority , -1 Martial Law , -1 Trained Caracal , -1 Ascended Lawmage -1 Soulsworn Spirit , -1 Niblis of the Mist , -2 Lavinia of the Tenth , -1 Arctic Aven -1 Island , -1 Plains
Proliferation is popular, and its something novel for the color trio to care about
Locthwain Scorn Call me a Cheatyface for including this, but Locthwain Scorn is in fact a black sorcery when you cast it
Every black deck needs this comprehensive answer to problematic board states
If it dies or goes to another zone before then, it will stay where it is