Khans of Tarkir

, Pay 1 life, Sacrifice Bloodstained Mire: Search your library for a Swamp or Mountain card and put it onto the battlefield. Then shuffle your library.

Casting Cost:

You may have Clever Impersonator enter the battlefield as a copy of any nonland permanent on the battlefield.

, Pay 1 life, Sacrifice Flooded Strand: Search your library for a Plains or Island card and put it onto the battlefield. Then shuffle your library.

Casting Cost: 

If one or more +1/+1 counters would be placed on a creature you control, that many plus one +1/+1 counters are placed on it instead.

Casting Cost:

Haste

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

, Pay 1 life, Sacrifice Polluted Delta: Search your library for an Island or Swamp card and put it onto the battlefield. Then shuffle your library.

Casting Cost:

+1: Until end of turn, Sarkhan, the Dragonspeaker becomes a legendary 4/4 red Dragon creature with flying, indestructible, and haste. (He doesn't lose loyalty while he's not a planeswalker.)

-3: Sarkhan, the Dragonspeaker deals 4 damage to target creature.

-6: You get an emblem with "At the beginning of your draw step, draw two additional cards" and "At the beginning of your end step, discard your hand."

Casting Cost:

+1: Until your next turn, creatures you control get +1/+0 and gain lifelink.

-2: Put a 2/2 black Vampire creature token with flying onto the battlefield.

-6: You get an emblem with "At the beginning of each opponent's upkeep, that player sacrifices a creature."

, Pay 1 life, Sacrifice Windswept Heath: Search your library for a Forest or Plains card and put it onto the battlefield. Then shuffle your library.

, Pay 1 life, Sacrifice Wooded Foothills: Search your library for a Mountain or Forest card and put it onto the battlefield. Then shuffle your library.