haunter
Banned deucer.
I agree with Mamoswine being a great lead, but I would never stay in against a Jirachi, a single flinch from iron head means that you've lost your lead and possibly your only stealth rocker on the team.LO Mamoswine is a pretty sick lead for me so far, as it basically comes out of every big lead matchup easy mode, outspeeding junk like Heatran and Metagross and OHKOing with EQ, surviving Jirachi's Iron Head and OHKOing, 2KOing Azelf and Aerodactyl with Ice Fang + Ice Shard.
I think that people often underestimate the usefulness of a suicide lead. I completely agree with Stathakis, when your lead sets up SR, prevents your opponent's lead to set up his own rocks and explodes or sets up a screen, I believe that it gives your team a great advantage over your opponent, especially if you're playing an offensive team.
Obviously, if you're going to play stall, such a lead would be pretty useless.