So I saw Dihada and instead of just spamming legendaries, my first thoughts went to, ok so let her make treasures. I can use Magda to tutor dragons... So here's my first pass on a mardu dragons deck that works as a sorta reanimation toolbox Big Red deck.

Breakdown of some choices:

Planeswalkers: Mostly for draw and discard, control, reanimation, and even some artifact/creature removal

Creatures: Dragons, dragons, and legendary dragons. I love the idea of 2'ing Dihada to give Inferno of the Star Mounts lifelink and then hitting 20 power. I get to play with Kaalia as a fair card for once. Zirilan and Magda get to tutor dragons as needed. Feldon gets to copy ones in the GY which is why this deck focuses on filtering cards.

Rest of the deck is mostly a little control, treasure making, ramp, and treasures for anything that needs them. I have no budget at all. The lands are just a placeholder for now and will include lifelink/deathtouch, haste, recursion, etc. Id like to add more dragons that would be useful if you think of any.

https://www.moxfield.com/decks/5Ebs1LY0HES-Zr3ZqCIvbw