T-Bolt raises a good question. On Showdown, Jirachi sometimes takes LO recoil from Doom Desire after switching out and coming back and using a non-attacking move. I haven't been able to pinpoint a pattern as to how many turns later Jirachi takes LO recoil, since it seems to happen at random.
On the topic of Doom Desire and Future Sight, these moves are amazing with Life Orb and the use of a shuffler partner such has Hippowdon and Skarmory. This prevents the opponent from being able to choose what teammate takes the powerful hit. It's always fun to drag something like Mega Venusaur in on a Future Sight, and most pokemon that resist the attack would take significant damage.
That is actually a very interesting point, as it would almost be guaranteed that the switch in would be someone they didn't want because they didn't switch to them in the first place.
Interestingly enough, Sigilyph is the only one with access to Future Sight and Whirlwind. Meaning you use the move, and then you Whirlwind out whoever they send in place to take it. And what's double cruel? Sigilyph has Tinted Lens. Meaning unless the switch in is a Dark type or a 4x resist, the opponent is taking 100% of the damage. With a decent 103 SpA this could cause problems, as you also have decent 97 Spd and access to Wonder Guard, Cosmic Power and Roost. And not that this isn't terribly gimmicky but it also has Miracle Eye, which lets Dark types be hit by Psychic moves. So if they have a Dark type on their side, the switch is so easily predicted, you hit them with Miracle Eye and they still get hit. That's just evil.
Sigilyph@Life Orb/Leftovers
Tinted Lens/Wonder Guard
Modest 252 HP / 4 Df / 252 SpA
~ Future Sight
~ Whirlwind
~ Roost
~ Heat Wave
With SR and one layer of Spikes this could cause serious havoc. Alternate between FS and Whirlwind with Roost as needed for prediction purposes. Heat Wave is there as a second attack if you predict something like Skarmory coming in instead and simply want to hit super effectively on the switch.
252+ SpA Life Orb Sigilyph Heat Wave vs. 252 HP / 0 SpD Skarmory: 338-398 (101.1 - 119.1%) -- guaranteed OHKO
252+ SpA Sigilyph Heat Wave vs. 252 HP / 0 SpD Skarmory: 260-306 (77.8 - 91.6%) -- 25% chance to OHKO after Stealth Rock
With Future Sight and Stealth Rock you can take out Skarmory in one turn.
252+ SpA Life Orb Sigilyph Heat Wave vs. 252 HP / 4 SpD Aegislash-Shield: 177-211 (54.6 - 65.1%) -- guaranteed 2HKO after Stealth Rock, 1 layer of Spikes, and Leftovers recovery
252+ SpA Life Orb Sigilyph Future Sight vs. 252 HP / 4 SpD Aegislash-Shield: 83-99 (25.6 - 30.5%) -- guaranteed 4HKO after Stealth Rock, 1 layer of Spikes, and Leftovers recovery
252+ SpA Life Orb Tinted Lens Sigilyph Future Sight vs. 252 HP / 4 SpD Aegislash-Shield: 166-198 (51.2 - 61.1%) -- guaranteed 2HKO after Stealth Rock, 1 layer of Spikes, and Leftovers recovery
With Tinted Lens you're guaranteed to take out Aegeslash switch ins immediately, even without any hazards.
252+ SpA Life Orb Sigilyph Heat Wave vs. 252 HP / 252+ SpD Mega Scizor: 364-432 (105.8 - 125.5%) -- guaranteed OHKO
252+ SpA Life Orb Sigilyph Heat Wave vs. 252 HP / 252+ SpD Ferrothorn: 328-390 (93.1 - 110.7%) -- guaranteed OHKO after Stealth Rock and 1 layer of Spikes
Ferrothorn and Mega Scizor are just gone no matter what.
252+ SpA Life Orb Sigilyph Heat Wave vs. 32 HP / 0 SpD Bisharp: 338-398 (121.1 - 142.6%) -- guaranteed OHKO
Bisharp? Not a problem
252+ SpA Life Orb Sigilyph Heat Wave vs. 252 HP / 252+ SpD Clefable: 97-116 (24.6 - 29.4%) -- possible 5HKO after Leftovers recovery
252+ SpA Life Orb Sigilyph Future Sight vs. 252 HP / 252+ SpD Clefable: 185-218 (46.9 - 55.3%) -- 15.6% chance to 2HKO after Leftovers recovery
You'll take a huge chunk out of Clefable. And if it's the Unaware version the hazards will almost make it a guarantee.
252+ SpA Life Orb Tinted Lens Sigilyph Future Sight vs. 252 HP / 0 SpD Latias: 190-226 (52.1 - 62%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
252+ SpA Life Orb Tinted Lens Sigilyph Heat Wave vs. 252 HP / 0 SpD Latias: 101-120 (27.7 - 32.9%) -- guaranteed 4HKO after Stealth Rock and Leftovers recovery
Tinted Lens makes an otherwise great switch in here, not so much. Stealth Rock means potential OHKO.
252+ SpA Life Orb Tinted Lens Sigilyph Future Sight vs. 252 HP / 252+ SpD Heatran: 164-195 (42.4 - 50.5%) -- guaranteed 2HKO after Stealth Rock, 1 layer of Spikes, and Leftovers recovery
Even Heatran will take about 50% with Tinted Lens. But Heatran, Tyranitar and the blobs are definitely the best switch ins, which is why pairing with a good Fighting type like Keldeo that was mentioned is a good idea.
This is getting interesting. Tinted Lens makes switching into this combo SO much harder than it would be otherwise. But Magic Guard is one of the best abilities there is, preventing Stealth Rock damage and Life Orb recoil. It's really a significant trade.