Convenient Target I'm grabbing Convenient Target for my red decks in MKM drafts, and I think Red Deck Wins in Standard may like a copy or two (although it being a sorcery-speed spell is a negative)
Atraxa, Grand Unifier Price: $14-17 A seven-drop for seventh place, I chose Atraxa, Grand Unifier
If you added white to your deck, you could do the same thing but with Ephemerate and get a third Thoughtseize for free at the start of your second turn
Another perfect example of this is Isshin, Two Heavens As One, which reads: "If a creature attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time." This is an incredible ability to have on a commander - and building a Commander deck around it is sure to be a blast - but in a Standard set it just feels off
Feel free to use this list as the basis for your own deck, swapping out creatures and spells to meet your own needs.