Outside of decks that are consistently casting spells for free, or are using a ton of cantrip effects, its difficult to justify Adaptive Training Post
Betor rewards you for playing bulky dragons, walls, or just sheer mass - and once you hit that 40+ toughness threshold, it turns into a game-ending clock, draining opponents for half their life every end step
All these counters can also make it easy for the player's creatures to all have different power/toughness than each other, fueling coven more easily
No requirements for you to have a land like a Check Land, nothing
Champion of the Perished , meanwhile, is a smaller Zombie that gets bigger as friendly Zombies enter the battlefield, and is worth $3.99
Its very rude and completely cuts off the winning strategies of many decks