For one red, they can cast Lightning Bolt and deal three damage to any target
If you chose 2 as the value of X, then Clash of Wills has converted mana cost 3, and Metallurgic Summonings's ability will create a 3/3 token
Because damage remains marked on a creature until damage is removed as the turn ends, damage previously dealt to a creature with indestructible may cause it to be destroyed if Shay Cormac's first ability resolves later during that turn
if you have no other cards in your graveyard, Elixir can gain you 5 life per turn
With its over reliance on the graveyard when it comes to certain combos, not to mention most aristocrats and reanimator decks, a Rakdos deck can be shut off completely by a savvy player recurring a Tormods Crypt, or a timely Scavenger Grounds activation
Instants and Sorceries Mainly counters and removal