Trinisphere and Phyrexian Mana
Hi,
Thanks for your question. Nope, this interaction hasn't changed. Choosing to pay 2 life instead of B means that you're spending less mana to cast it, and can make Trinisphere apply to the spell. For example, if you want to cast Dismember with a Trinisphere in play, you have three options: 1BB, 2B and pay 2 life, or 3 and pay 4 life.
Thanks,
Nathan Long
Magic Rules NetRep