The only real cost is that you need to feed Contamination by sacrificing a creature during your upkeep to keep the effect going
Kraum, Ludevics Opus A flying threat that punishes spell-heavy tables while generating steady card advantage
I thought about changing but my friends were saying that you're a one-trick pony at this point, just stick with it, and thats what I did. Experience with the deck allowed for a greater understanding about what works best in the format to both support the plays they make and counter opponents, which had an influence on the choices made
You could effectively play this way indefinitely, earning rewards, expanding your collection and playing standard Magic: The Gathering
In that context, rather than wasting time, spending an extra $15 or so could be worth it
Elturel isnt the only thing Descending into Avernus, ehehe