Seriukh of the White Wastes

As Seriukh of the White Wastes enters the battlefield, each player chooses a creature. Destroy the rest. Create a 1/1 colorless Sand creature for each creature destroyed this way.
Flying
Sacrifice three Sand creatures: Creatures you control gain Exalted until end of turn. (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)