If Aatchik is dealt lethal damage at the same time as another Insect you control, Aatchik's last ability will still trigger, causing each opponent to lose 1 life, but Aatchik won't get a +1/+1 counter in time to save it
A while ago I wrote about how an average d20 roll with Ancient Copper Dragon in a Zirilan of the Claw deck can result in a one-turn kill, and thats just my weird junk combo
Just like The Lord of the Rings: Tales of Middle-earth, this means Wizards has no end of content to pull from
For triggered abilities, the key words to look for are At, When, or Whenever
The Lost Caverns of Ixalan Product Overview The Lost Caverns of Ixalan Draft Boosters The Lost Caverns of Ixalan Draft Boosters each include the following: 1 Rare or mythic rare 1 Double-faced common or uncommon 3 Uncommons 9 Commons* 1 Land Non-Basic Cave 70% of the time Core full-art basic land 30% of the time *1 Traditional foil card of any rarity replaces a common in 33% of Draft Boosters
Because you can