If something is also wildly powerful in the 99, or simply unfun all around, were fine leaving it on the list, but power alone isnt a reason to list it as a Game Changer
Control players keep opponents guessing whether they have board wipes or not, but if you drop a couple of creatures and they destroy one of them then you can guess that they dont have a wipe, indicating that you should follow up with another creature
Whether you sacrifice actual Food Tokens or your other creatures to gain life, or when the creatures die due to any other means, Ygra grows by two points for both power and toughness each time, making her so much larger, so much faster
You can never have too much card draw
What makes it good is that there is no cost to activate the effect
Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Pauper