The Future is Neverending Rats

Play with the top card of your library revealed. You may play lands and cast spells from the top of your library.

Any player may cast creature spells with mana value 3 or less without paying their mana costs and as though they had flash.

Whenever a creature you control enters, you may look at the top X cards of your library, where X is that creature's power. If you do, put one of those cards on top of your library and the rest on the bottom of your library in any order.

This creature gets +1/+1 for each other creature on the battlefield named Relentless Rats. A deck can have any number of cards named Relentless Rats.