Limited manabases typically adhere to similar guidelines to what I laid out in my article on Constructed manabases
Black/red: SACRIFICE TEMPO (AGGRO) In terms of power level, Im not really sure this deck can measure up to the solid tribal synergies offered by the white/black deck
Of course youll need a way to stop the loop before decking yourself here, but all you need to do is have another creature to put a counter on
Getting rid of problematic cards from yards on ETB or attack is spicy
Shiko and Narset, Unified Shiko and Narset, Unified has the floor of drawing a card when you cast your second spell, which is fairly highcard draw is one of the best payoffs you could ask for
Conclusion Starter Decks are the best way for new players to enter Lorcana, and so it is important to have an idea of what the deck's plan is and what possible adaptations and improvements can be made