(If this matters, you must have a very good reason for wanting to pay life.) If the target Equipment can't legally be attached to the target attacking creature when Raubahn's last ability resolves, the Equipment won't move
It has item buffs, but only has a few items
Every typal deck wants Urza's Incubator, so it demands a high price
Effects like Tectonic Instability and Price of Glory force action from your opponents on their turn, making them effectively play at sorcery speed or suffer the consequences
It doesnt matter what they kill, because youll be able to make more of something else
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Cat you control may become lethal if Feline Sovereign leaves the battlefield during that turn