mana cost (at least compared to other creatures of the time)
Some standout cards in this deck are Anguirus, Armored Killer / Gemrazer for some enchantment and artifact removal, Godzilla, Primeval Champion / Titanoth Rex for instant-trample enabling, and Jumbo Cactuar, because power matters is fun
Its a cheap spell to sling, it works with reds increasing pool of discard synergies, and it interacts favorably with graveyard strategies
The set also does a good job of including minor characters as legendary creatures
What about protection from humans
The reason for the Tocatli Honor Guard is because exiling effects are very effective against this deck and a lot of these effects are creature etb based so they should really be in the 75