If I had to choose one of the mentioned cards, I might choose Illusionist's Gambit because it feels like a better fit in a blue-colored control deck, rather than Boros which is usually aggressive
Now one of the hidden mechanisms in MTG Arena comes into play, something called an MMR (Match Making Rank)
Thats an eternity in Commander, so I wouldnt expect Concierge to come back more than once per game, but that also means the other creatures youre suspending in limbo also become non-factors most of the time
Having fun in EDH is the point after all, if you arent having fun, why are you playing
This alone will make your opponent think twice before even looking at her funny
Even though a harder-to-cast Doom Blade does not scream for eternal play, it still does something without morbid