Hello!

What Peagout said above is correct. Currently, we have no way to check how many Seals we've already used in one Treasure but to compute a rough estimate of it only by checking how many rares you already got. As for the Great Ninja War Treasure's Super Rares, it is indeed 50-50 chances to get either Madara Uchiha [Founder of Konoha] and Naruto [Kurama Mode]. But if you already got one of them, next time you pull a Super Rare will be sure the other one. Thank you.