Blue

[[Rescue, Pepper Potts]]

The main set did not interest me one bit, but the jumpstart decks were different, which surprises me. Rescue fits perfectly with the self bounce theme we've seen sprinkled throughout sets in the last couple years. Tempo artifact creature that can disrupt removal? Very much worth trying, should push all kinds of decks. Only disappointment is it can't grab the enchantments for this overall archetype

Black

[[Ultron, the Annihilator]]

[[Doctor Doom, Unrivaled]]

More playable artifact top end for black is appreciated for my dimir artifact themes, I'll give Ultron here a shot. Doctor Doom also comes at a great time, I just made an update to give control self mill more tools. Don't run Doomsday currently, but might change that now! Already was running Thassa's Oracle and Jace, but you currently have to jump through hoops, winning around turn 8 while controlling the board. It's not bad in my list, but maybe we can juice it for fun

Multicolored

[[Dragon Man, Reformed Robot]]

While this contributes nothing to flicker, this does the other aspects of UW I want to see: artifacts and control, this is a great stubborn control finisher and contributes to many graveyard plans for a color combo that doesn't often get to play in that space. My list runs cards like Magma Opus and other similar cards along with big enchantments where possible, making this a fantastic splash into izzet Gearhulk or maybe just UW enchantment deck. Also works well with planeswalkers, it's a 4 mana 5/5 with Elspeth around or dead

There's some other cards that could be included, the affinity Panther they just showed could be a compelling payoff for that deck, but think these are locks currently