Minsc & Boo, Timeless Heroes are a formidable planeswalker
"My hands were literally shaking
This card could be played main deck if your deck is quite heavy on devotion synergies
Plus, since Sivriss can be played with a background, you can fit red and add some theft effects
One does have to be cautious with spells like this, as your opponent removing the creature you target is an epic blow out, but because its an Instant, it wont be that hard to find an ideal window
As of the release of the OP16 The Time of Battle booster set, Blue/Green Luffy has quickly become one of the decks players have to prepare for, which gives him immediate weight in the wider green leader conversation