Echo

[Double-O-Scotch]

Are echo costs a triggered ability? Does echo use the stack?

[rarehuntertay]

From the Comprehensive Rules (Fate Reforged)

702.29. Echo
702.29a Echo is a triggered ability. "Echo [cost]" means "At the beginning of your upkeep, if this permanent came under your control since the beginning of your last upkeep, sacrifice it unless you pay [cost]."
702.29b Urza block cards with the echo ability were printed without an echo cost. These cards have been given errata in the Oracle card reference; each one now has an echo cost equal to its mana cost.

Yes, and yes, as triggered abilities go on the stack.

[Double-O-Scotch]

So can I stack the beginning of upkeep triggers for {karmic guide} and {Reya Dawnbringer} so that I don't pay the echo and sac, return karmic guide to play with Reya and return the karmic guide and use the karmic ETB to return something else?

[Remillo]

So can I stack the beginning of upkeep triggers for {karmic guide} and {Reya Dawnbringer} so that I don't pay the echo and sac, return karmic guide to play with Reya and return the karmic guide and use the karmic ETB to return something else?

This doesn't work since you have to declare the targets for Reya when the ability goes on the stack.

[Double-O-Scotch]

Perfect! Thank you!