Don't know if I'm doing this right but I came across a bug with Solphim, Mayhem Dominus. I am playing on PC and I had Solphin Dominus out with one untaped land (Jagged Barrens) and three cards in my hand and 14 Hp. Instead of being able to sacrifice 4Hp and two cards to give it indestructable It only gave me the option to pay 3 mana. I have used solphim before and know this shouldn't happen and that I should have been able to sacrifice life instead.