I've had the most success between the Taken Ultras from the 'skull' patrols, the Taken Champions from the Taken corrupting the area events, the Ultra Knight on the Dreadnaught and mixing in a quick Gate Lord/Winters Scourge/Entropy's Pinnacle mission. I don't get large chunks of time for raids, so I usually pop a coin as I am working on bounties, the daily mission, doing some Court of Oryx or just on patrol trying to rank up a faction./Cryptarch/Vanguard. I've found that a very quick and easy 'higher-level' mission with a qualifying Ultra, is Entropy's Pinnacle. Just spawn in, race to and up the Citadel, beat up a few easy Taken, shoot up the lift, hop across the 'platforms', speed through a few easy Taken's to trigger the Echo to spawn, race back to the first tall floating platform (before the 'main landing area') and snipe away (even Ice Breaker works like a champ) or send a few tracking rockets into the Ultra-- all without having to dodge, evade, kill any other enemies...completely out of harms way. It's a super, super quick mission and only requires popping a pill...I mean coin, using a couple bullets and about 8-10 Sniper rounds or a couple rockets-- minimum effort and time required. I usually mix it up every 15-20 minutes-- spawn into Cosmodrome and look for skull/crossbone patrol (leaving if none there), pop a coin, kill the taken champion since it seems to 'show up' there consistently. Then head to orbit, hit Dreadnaught and farm chests for runes, CoO for 10 minutes and then pop a coin, make the Ultra Knight 'Silent Scream'. Head back to patrol or CoO or join in on a Cabal Champion/Hive Stalking Party Ultra, for about 10 minutes. Then hit the Entropy's Pinnacle, pop a coin and race through that....then back to patrol and so on, and so on. And maybe mix in the Gate Lord and a Taken Public Event on Earth, Venus or Mars here and there. I have 3 kids (w/ 2 year old twins), so raiding and running strikes can be a bit difficult to accommodate or keep up with the other members of the team, so the Patrol/Dreadnaught/Taken Champs/Gate Lord, Entropy's Pinnacle, Winter Scourge method really suits me well-- for when I have to pause to wrestle with kiddos or deal with some double-dooty. I pretty much average 1 Exotic Engram for every 4 or 5 coins used...using them once every 15-20 minutes, as intended. But for me, the above method works wonders and yields the best Exotic returns. Good Luck!

I use 5 at a time and get an Exotic every Ultra kill 5-1 works fine for me and I only have to run the 1 Ultra.

Anywhere that there is an ultra

Just got a heavy engram from crucible :)

There's an ultra knight on dread patrol in the ship hull. Just head inside the ship and in a big open room there's a closed door (what you would go into for bond brothers strike). When you get to the door look up and left and jump up and over the door. Run through the bridge and there's the knight. Once you have it down it's about one minute to get to the ultra each time. Of course you should wait 15-20 minutes between each kill. Also you'll have to return to orbit to respawn him.

Go farm the Ultra Knight on the dreadnaught patrol. I have close to 30 exotic engrams in my vault just from the last two weeks.

Why you no like me? :-(