This is presumably because enemies in previous scenarios had parley options as alternatives to fighting them, as you see in the Night of the Zealot campaign
Todays Thousand Meeting Sample Decks are based around Insector Haga, a.k.a
Custom X-Men MTG Cards: Charles Xavier, Professor X Erika Lensherr, Magneto James Howlett, Wolverine Remy LeBeau, Gambit Bobby Drake, Iceman Samuel Guthrie, Cannonball Hank McCoy, the Beast Anna Marie, Rogue Xaviers School for the Gifted Utopia Island Kurt Wagner, Nightcrawler Alex Summers, Havok Lucas Bishop ResurrXion Generations Sean Cassidy, Banshee Helm of Magneto Frederick Dukes, the Blob Victor Creed, Sabertooth Amahl Farouk, Shadow King Pietro Maximoff, Quicksilver Kitty Pryde, Shadowcat Scott Summers, Cyclops Ororo Monroe, Storm Clarice Ferguson, Blink Piotr Rasputin, Colossus Days of Future Past Sentinel token Emma Frost, the White Queen House of M Legacy Jamie Madrox, Multiple Man Wanda Maximoff, Scarlet Witch Nathaniel Exxex, Mr
7 Felidar Sovereign Next us is one big old cat
There are so many +1/+1 counter synergies these days that its incredibly easy to make an oppressively powerful deck with that strategy, and I personally dont like the mental energy required to keep track of all the various triggers those strategies accumulate on the battlefield
That thousends of Cards that were made