Assimilation Aegis may not excel at buffing a creature, but rather works towards clearing the board of problematic threats
This made what shouldve been an exciting crossover feel like a cash grab and, while Wizards of the Coast is a company that obviously wants to make money, it feels rather blatant when it weaponises FOMO like this
For example, Harvestrite Host is a Rabbit that clearly benefits from putting lots of other Rabbits into your deck
Don't get me wrong, you're not completely unhappy casting this for four in the early- to mid-game to remove a utility creature that's giving you conniptions, but in reality, the only time you want to see this is when you have 40 mana available
If you somehow control two or more Genku, Future Shapers, track which modes have been chosen each turn for each one's ability separately