Seraph of New Capenna // Seraph of New Phyrexia (March of the Machine)

Creature Ñ Angel Soldier // Creature Ñ Phyrexian Angel - Seraph of New Capenna: Flying
{4}{B/P}: Transform this creature. Activate only as a sorcery. ({B/P} can be paid with either {B} or 2 life.) // Seraph of New Phyrexia: Flying
Whenever this creature attacks, you may sacrifice another creature or artifact. If you do, this creature gets +2/+1 until end of turn.