If the saved amount of mana isn't enough to kill said target (or player) you can tap some Mountains and add to the damage being dealt
In the case where the target creature is copying something else when Echoing Assault's second ability resolves, then the token enters as whatever that creature copied, except it's a 1/1
But you cant just play your best cards on round one, because each card costs mana and gaining mana takes time
Outside of that, it might see play taking out Lotus Fields in Constructed, since the ability intentionally doesnt target
Main Collectable Card Games Magic: The Gathering Cultivate (Surge-Foil) Cultivate (Surge-Foil) Casting Cost: Card Type: Sorcery Card Text: Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle