Calling Conch

You may sacrifice an Echo creature rather than
pay Calling Conch's casting cost.
{t}: Turn target creature with a morph ability
face up. During your next upkeep exile creatures
turned face up in this way.
{t}, Sacrifice Calling Conch: Return all creatures
exiled with Calling Conch face up to the
battlefield. They gain haste until the end of the
turn. Sacrifice these creatures during your next
end step.