Savitar The God of Speed

Hexproof, Vigilance, Double strike, Flash, Trample
as an additional cost to cast this spell sacrifice 1
Hero Speedster creature.
{e}{e}{e}{e}{t}: Deal 3 damage to any target.
{e}{e}{e}{t}: This creature phases out.
{3}{x}: Exile this creature return it to the
battlefield in {x} turns any player may
activate this ability.
This creature can't be regenerated.