Summon: The top spell of your deck gets Echo.
Elysian Trailblazer is a Unit.
How to Get
This card can also be obtained from Card Packs. Diamond Chests and Card Packs can give Premium versions of this card.
Play with cards like Static Bolt or Second Sight (goes infinite if you decrease its cost to 0 and get 3 in hand with echo) for increased value, or with cards that give you draw like Wisdom of the Elders for card advantage.
If the top spell of your deck already has Echo, the topmost spell in your deck without Echo will gain Echo.