In exchange for their loss, all your opponent gets is a land that might be useful in the early game, but will decrease in value as the turns pass, making Assassins Trophy stronger and stronger as time goes on in turn
Below is an example, I wanted to composite the art from the 2012 Lifelink onto a 10th edition plains
Disney Lorcana Card Sleeves Scar Vengeful Lion JAPAN OFFICIAL
There are very few ways to actually lose energy counters outside of spending them, but it is possible with stray cards like Suncleanser and Final Act
Livio, Oathsworn Knight 1 Cool looking card but too mana intense and lacking in combat potency for cube interest
Every time you play a threat, chances are good that there are two more threats and and answer being played across the table