Its Wizards of the Coasts way of impacting MTGs secondary market and helping to level out some overpriced format staples to make them more accessible
Ingest is not a strong enough mechanic for your opponents to worry about enough to sacrifice an important creature to block a creature with deathtouch, so you'll often be able to swing unopposed
Why you should sell your bulk Pokmon cards Do you have a massive collection of Pokmon cards you want to get rid of
The difference is, at least with the actual cards - you know, the real-life cardboard ones - you've got a collection of cool things, and, more importantly, there's some resale value
That just isnt the case with Relentless Rats and Rat Colony, which is why I also took a less gimmicky approach to building around Karumonix
In my experience, the Game Changers that win the most games are the ones that generate persistent card advantage: Rhystic Study, Smothering Tithe, Necropotence