Until the controller's next turn, whenever those creatures deal combat damage, you get to draw a card
There is no mana cost at which this effect would be playable as-written
A closet shelf beats a windowsill every single time
That said, there are other, more affordable wheels, like Time Reversal in blue, Wheel of Fate in Red, and Dark Deal in black
However, the most prevalent example of this playstyle in recent memory was the Centur-Ion archetype, and Centur-Ion is crucial to this archetype's ability to play during the opponent's turn
While Craft has some additive abilities that can cause confusion, and Descend or Descended really feels like three different keywords mashed into one, the new MTG Discover mechanic is definitely the most complex of the three at least, without additional context