As I said earlier, by relying on a parasitic mechanic like energy its very hard to fully take advantage of the massive card pool that Pioneer offers
The first time split cards were seen was all the way back in 2000 during the Invasion Block, where each spell of the two spells would be a single colour
Spending a measly 1 mana to blank every copy of Counterspell, Force of Will, and Fierce Guardianship in your opponents decks is one of the best exchanges you can make
We don't believe this card will sell for millions of dollars like other copies of the Wagner have but when the opening price is 25 grand, we'll assume that even half a Wagner is still going to be worth a pretty penny
This is exactly the tactic Wizards took when it finally banned Affinity in Standard
Xanathar, Guild Kingpin, for example, is the beholder at the centre of the Xanathar Thieves Guild and here allows you to steal other peoples cards straight from their libraries