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Sandsteppe Citadel enters the battlefield tapped. {T}: Add {W}, {B}, or {G} to your mana pool.
Creatures you control get +1/+1. Whenever you tap a land for mana, add one mana to your mana pool of any type that land produced.
Equipped creature has deathtouch. Whenever equipped creature deals combat damage to a player, that player loses half his or her life, rounded up. Equip {3}
You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast.
Until end of turn, target creature gets +3/+3 and gains trample and "Whenever this creature deals combat damage to a player, draw that many cards."
Choose a nonland permanent you don't control, then each other player chooses a nonland permanent he or she doesn't control that hasn't been chosen this way. Destroy all other nonland permanents.
Worn Powerstone enters the battlefield tapped. {T}: Add {C}{C} to your mana pool.
Target player draws four cards.
Enchant creature Enchanted creature has haste and "At the beginning of your upkeep, destroy this creature. Reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and attach Shifting Shadow to it, then put all other cards revealed this way on the bottom of your library in a random order."
Flying, vigilance Whenever a Dragon you control attacks, tap target nonland permanent an opponent controls. That permanent doesn't untap during its controller's next untap step.
Choose one — • Destroy all Dragon creatures. • Destroy all non-Dragon creatures.
Flying Whenever you draw a card, Niv-Mizzet, the Firemind deals 1 damage to target creature or player. {T}: Draw a card.
Flying Whenever Niv-Mizzet, Dracogenius deals damage to a player, you may draw a card. {U}{R}: Niv-Mizzet, Dracogenius deals 1 damage to target creature or player.