Cheapest way to make a large retaining wall

I have almost 1/3 of an acre backyard that I will be re-establishing soon, and one of the projects will be a 2-3 ft tall retaining wall that will be approx. 25 feet in length - it will be very visible! What are some attractive and less costly ideas? (I'm putting tiers into a sloped yard hoping to correct the drainage problems.) the concrete is gone and the sand will be mixed in with new top soil and mulch. The wall will follow the far curve and extend out 10-15 ft.
q cheapest way to make a large retaining wall, concrete masonry, landscape, outdoor living
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