This is correct and I am the SAME WAY I gotta have that buff first because YEARS of snapshotting have corrupted me. xD
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Farm Gnarled Root ASAP from Darkheart Thicket and get it at a minimum of 840 before you stop farming it. Remember, Mythic + do not have lockouts so you can run them over and over again.
The second trinket, the haste/proc one from the first dragon in EM is my personal favorite. If you can't get that, get a int/haste one from world quests or chrono shard.
If you're super lucky, get the Arcanocrystal from the world boss.