You could make it optional: (Other changes suggested to balance the power)
Wall of the Tangle - 1GG
Creature - Plant Wall
Double Echo (you may chose to play either Echo cost)
Echo 1
Echo g, return Wall of the Tangle to its owner's hand.
When this comes into play, draw a card.
0/4
So you get a wall or cards, or cards and then a wall depending on what you see across from you. The initial cost would then be a little high for a 0/4 wall (2GG) but 1GGG shouldn't be too much for a recurring Wall of Roots.