The ability that creates Vecna will look at the cards in exile, not the permanents on the battlefield, so it's possible to have Vecna gain different triggered abilities.
As long as a plane card is face up in the command zone, its static abilities affect the game, its triggered abilities may trigger, and its activated abilities may be activated
Runic Armasaur in general seems to have a low ceiling into certain decks, holding it back a bit
Jumbo Cactuar is a 1/7, which gets a +9,999/+0 buff when it attacks
Our Five-Headed Finale Temple of the Dragon Queen | Illustration by Cliff Childs Dragon tribal is a tried-and-true casual EDH archetype, and its only going to get better with time considering WotCs tendency to print new dragons