for _ in range(int(input())):
    n, W = map(int, input().split())
    a = list(map(int, input().split()))
    w = []

    for i in range(n):
        if a[i] <= W:
            w.append((a[i], i+1))

    w = sorted(w, key=lambda w: w[0], reverse=True)
    c = 0
    ans = []
    for i in range(len(w)):
        if c + w[i][0] > W:
            break
        c += w[i][0]
        ans.append(w[i][1])

    if c >= (W+1) // 2:
        print(len(ans))
        print(*ans)
    else:
        print(-1)