I think crafting big monsters is fine - you're not ordering anyone to use them, after all :) It's an amusing hobby for one's self and if someone actually uses them for an epic-level campaign, so much the better.

I will say, as an old-school MTG player (who hasn't touched anything since Odyssey), I don't recognize the current game at all. Indestructible? Playable Planeswalkers? Bah humbug! :D