It's a 2-card combo that, after you play both cards, results in +1 Action, +$4. Quite powerful effect, definitely too strong to appear on a single card. I played this once and it worked really well.
Actually just $4, since Mining Village gives +2 Actions and playing MV and Rogue costs 2 Actions.
Mining Vilage: +1 card, +2 actions, +$2, trash
Rogue: +$2, gain MV
Total if it was on one card:
+1 card, -1 card = no card effect
+2 actions, - 1 action = +1 action
+$2 +$2 = +$4
Lose MV, gain MV = no effect
So if it appeared on one card it would be:
+1 action, +$4 (for a card cost of $9 and an extra buy)
Can we do better with $9 and two buys? What about this:
Border Village, Mandarin, tournament
+2 actions, +1 action -2 actions = +1 action
+1 card, +1 card, -1 card, -2 cards = -1 card
+$3, +$1 = +$4
And it takes $10 to get, not $9.
Another attempt:
BV, market, duchess (cost: $8)
Actions: +2, +1, -2 = +1
Cards: +1, +1, -2 = 0
$: +1, +2 = +$3
So $1 cheaper, but provides +$3 instead of +$4.
So I think there is a synergy from Rogue+MV. It's not huge though, but it might be the cheapest way to produce that exact effect from a $9 two-card combo.
Ed