I don't know if you're a player (cheapest TCG to play seriously) or a collector, but the hard truth is that most people don't seem to collect to complete sets
Considering ReshiZard has a whopping 270 HP (which is high even for Tag Teams), it has a lot of room to pile up damage counters and turn that into a devastating attack
When a Modal Double-Faced card isnt on the battlefield or the stack, it only has its front face characteristics
Galloping Lizrog Galloping Lizrog basically doubles the number of +1/+1 counters on your side of the field, but in a very eggs-in-one-basket approach
Ultimately, any mechanic that alters the fundamental rules of the game across all formats should be considered incredibly carefully, especially when it will drastically warp all future gameplay around a handful of new cards
Once you have a solid crewing engine on the battlefield, all your Vehicles can discount Urza for each one you control that's currently a creature, to get it onto the battlefield quicker