Trading one card for one of your opponents (a one-to-one trade) is usually considered the baseline value to strive for, but there are keywords that can help tip the scale more in your favor
1 General's Enforcer
You can get counters in some Magic sets, but most often players use other objects as markers
When I did a Google search, all I found were images that were either Halloween-based, derivative of Pirates of the Caribbean (either the ride or the movies), or even based on an actual Pluto cartoon called "Pantry Pirate"
If you can make it impossible for them to beat you, the thinking goes, then the question of how to win yourself becomes much simpler
As weird as it sounds, being two different cards actually makes the aftermath cards significantly less playable than flashback cards, which have the same effect twice