Each sleeve has black and green art that represents the life and decay of the Golgari Swarm
When two monster cards collide on the field, they are flipped face up, and a battle is commenced similar to the trading card game, with life points deducted accordingly
In fact, with a retail value close to the one of some of the most pricey meta-relevant deck, those who are mainly interested in playing the game, may prefer to invest their money on cards they can use instead of into an item for display
You could make a case of making it 3 copies, but being reliant on having the opponent have monsters is not worth it
Commanders like Kenrith, the Returned King and Zacama, Primal Calamity use this well, as does anything that makes Clue or Food tokens