You can keep the engine going with ways to give those creatures that came back with the +1/+1 counter a -1/-1 so that they can keep coming back to the battlefield if they happen to die
Why Raven's Crime is so good is when you pair it with cards like Life from the Loam
Even though it has a cost of three and comes with 8 strength, that counts for nothing by itself because landing on the battleground as is will cause it to die immediately, splattered on the pavement
On the other hand, the competitive scene features something called rotations that are designed to standardize a fixed number of legal cards at any given point
Outside of indestructible, not too many targets will survive the direct ire of our archenemy planeswalker
When Gaston shifts, he will not have Reckless because that temporary keyword was not added, so no ongoing effect is happening