Valakut, the Molten Pinnacle [Zendikar]Set: Zendikar Type: Land Rarity: Rare Valakut, the Molten Pinnacle enters the battlefield tapped. Whenever a Mountain enters the battlefield under your control, if you control at least five other Mountains, you may have Valakut, the Molten Pinnacle deal 3 damage to any target. {T}: Add {R}.

tap all lands that player controls that could produce any type of mana that land could produce

That was enough

Set: Alpha Edition Type: Enchantment Rarity: Common Cost: {1}{W} {1}: The next time a green source of your choice would deal damage to you this turn

Its venom induces a fever that causes its victims to relive the attack in recurring

"Look to the north

each of your other opponents sacrifices a land

Set: Hour of Devastation Prerelease Promos Type: Sorcery Rarity: Rare Cost: {4}{R}{R} Shuffle your library

in this time of rebirth

The fastest way across the dunes is above

Set: Legions Type: Creature — Human Wizard Mutant Rarity: Common Cost: {4}{U} {7}{U}: Glintwing Invoker gets +3/+3 and gains flying until end of turn

counter it

Set: Arabian Nights Type: Land Rarity: Rare {T}: Add {C}