Kai'Sa, Daughter of the Void

Flash
If you cast Kai'Sa after blockers have been declared, she will enter the battlefield tapped and attacking
Icathian Rain - whenever Kai'Sa attacks she deals 1 damage to each creature defending player controls. If that player controls no creatures, she deals 3 damage to that player instead.
If Kai'Sa has dealt 5 or more damage to a player this turn, search your library for an artifact or enchantment,