Mulan Soldier In Training: A four cost Ruby character with the Rush keyword has a Strength of four and Willpower of three
The buff Don Andres gives to stolen creatures as well as the Treasure tokens he generates when you cast noncreature spells that don't belong to you are nice, but they're far from enough to make stealing cards worthwhile (especially because the treasures enter tapped)
It generates two treasure tokens whenever you deal combat damage to an opposing player, but for one mana, it also lets you sacrifice treasure tokens to reduce a target creature's power and toughness by that amount
The one-of-one version was famously bought by Post Malone for two million dollars, and since then the card has been the bane of formats like Modern and Legacy thanks to its sheer power
Format-Based Storage Format-specific organization provides a practical way to organize your deck box contents based on how you actually play
In Modern I think the RG Prowess deck is slightly behind the URx version (mostly because theres no such a card as Preordain)