#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1 << 18;
const int M = 3e6;
const int Q = 1e5 + 20;
int T, n;
ll H, sum[20][Q];
bool dp[N];
int t[Q], len[Q];
vector<ll> node[20];
struct LINE{
    int l, r;
    ll sum;
}line[N];

bool cmp(int x, int y){
    return len[x] - t[x] > len[y] - t[y];
}

bool findans(int x, int y, int mid){
    ll res = line[x].sum;
    int asd = min((int)node[y].size(), mid - line[x].l);
    res += sum[y][asd];
    return res >= H;
}

bool findlen(int x, int mid){
    return line[x].r <= mid;
}

bool check(int mid){
    for(int i = 0; i < 1 << n; i++){
        dp[i] = false;
    }
    dp[0] = true;
    for(int i = 1; i < 1 << n; i++){
        for(int j = 0; j < n; j++){
            if(i >> j & 1){
                int res = i ^ (1 << j);
                if(!dp[res]) continue;
                if(findans(res, j + 1, mid)) return true;
                if(findlen(i, mid)) dp[i] = true;
            }
        }
    }
    return false;
}

void init(){
    for(int xx = 0; xx < 1 << n; xx++){
        int x = xx;
        ll res = 0;
        vector<int> id;
        int qwe = 1;
        while(x){
            if(x & 1){
                id.push_back(qwe);
                res += sum[qwe][0];
            }
            x >>= 1;
            qwe++;
        }
        sort(id.begin(), id.end(), cmp);
        int l = 0, r = 0;
        for(auto it: id){
            r = max(r, l + len[it]);
            l += t[it];
        }
        line[xx] = {l, r, res};
    }
}

int main(){
	cin.tie(nullptr)->sync_with_stdio(false);
	cin >> T;
	while(T--){
		cin >> n >> H;
        init();
        for(int i = 1; i <= n; i++){
            node[i].clear();
            sum[i][0] = sum[i][1] = 0;
            cin >> t[i] >> len[i];
            for(int j = 1; j <= len[i]; j++){
                ll x;
                cin >> x;
                node[i].push_back(x);
                sum[i][0] += x;
                if(j == 1) sum[i][1] = x;
                else sum[i][j] = sum[i][j - 1] + x;
            }
        }
        int ans = -1;
        int l = 1, r = M;
        while(l <= r){
            int mid = (l + r) / 2;
            if(check(mid)){
                ans = mid;
                r = mid - 1;
            }
            else l = mid + 1;
        }
        if(ans != - 1) ans --;
        cout << ans << endl;
	}
	return 0;
}