Id recommend avoiding the each opponent mode unless itll win the game but across three choices with the other two modes, its not unrealistic to remove three or four permanents with this one card
The top card of my library is a creature card, and something puts the top card of my library into my graveyard
Whether or not the combo potential locked inside this card will be useable, however, remains to be seen
Activating Lethal Vapors' activated ability is an "action", so the players are not required to take it in order to break the loop
This list focuses on cards that can put counters on themselves and others, with a bias towards Commander and Cube, though all-stars in other formats can show up
Some minds build worlds more naturally this way