Sure, stopping them from attacking can be nice, but it isnt usually worth buffing an opposing creature, especially because it isnt like Erriette is invulnerable
A tutor in MTG allows you to search a library for 1 or more cards, then place the selected cards in a more accessible location, such as your hand, the top of your deck, your graveyard, the battlefield, or in exile
All your win conditions, threats, and accelerants revolve around having lands either enter the battlefield or capitalize off lots of mana
Liliana's Devotee, Liliana's Mastery, Cursecloth Wrappings, Gisa, the Hellraiser, and Death-Priest of Myrkul are additional lord effects that arent zombie creatures themselves
Slide Cap' in to the Jeskai commander and back up the Super-Soldier with cards like Proud Pack-Rhino, Aegis of the Legion, and Boon of Safety
Right off the bat, the turn you play Twinflame Tyrant, your attacks with your other creatures become a lot more threatening