I made a list of all international appearances teams have had, grouped by region
I'll note exceptions and special cases at the bottom
This includes Copenhagen
NA:
Sentinels- 3
OpTic/NV- 4
V1- 1
XSET- 1
100T- 1
C9- 1
Guard- 1
EMEA
FNATIC- 4
Liquid- 3
M3C/GMB- 2
G2- 2
Guild- 1
SMB- 1
Acend- 2
FPX- 1
BR
Sharks- 1
Vikings- 2
Loud- 2
NIP- 1
Vivo Keyd- 2
Havan Liberty- 1
Furia- 1
LATAM
KRU- 5
Leviatan- 1
KR
VS/DRX- 4
Nuturn- 1
F4Q- 1
SEA/APAC
X10/Xerxia- 4
PRX- 3
Team Secret- 1
Full Sense- 1
JP
Zeta- 2
Crazy Raccoon- 3
Northeption- 1
Special notes:
-KRU are the only team to make an appearance at every international tournament
-FPX should have been at Iceland 2022 but they were unable to attend due to the Russian-Ukraine conflict
-Longest international drought: V1: no international appearance since Masters 2 2021
Edit: I missed more than a few teams and I've since added them, sorry about that. Guard, FS, and Furia have all been added