(1/24/2025) A creature's mana value is determined solely by the mana symbols printed in its upper right corner (unless that creature is the back face of a double-faced card, is a melded permanent, or is copying something else
A tribal deck focusing on a specific creature type, such as Goblins, Elves, or Merfolk, would benefit greatly from using Door of Destinies as it can quickly boost the power and toughness of all creatures of that type
I dealt with Dorian, and he was so great to work with
Second, dont forget about the blank proxy cards, which have some decent value in and of themselves
You may play a land this way only during your own turn and only if you have not yet played a land this turn
This is a very potent survival ability, and it isnt very hard to get a creature tapped