From the preview:
Dice Masters Fans! The Marvel Dice Masters: Iron Man and War Machine Starter Set is coming soon, and we’ve got some exciting previews of what cards you’ll see! Today we’ll be showing off three cards with the brand new Suit Up keyword!
When Tony Stark wants to suit up with his armor, he doesn’t have to wait, and now neither do you! When you purchase a character die with the Suit Up keyword, you can immediately field it on its level two side if you KO another character die that matches its keyword.