Whenever one or more creatures or artifacts you control are put into the graveyard from the battlefield, draw a card
Emerald Sapphire is all about Inventors, and when characters with that keyword enter the mix youll want to compliment them with Support characters, Locations, and Items that allow you take full advantage
On an empty board she makes beaters, with topdeck mode she can haste-enable your creature to hit first, she can kill or trample out of a locked board state, and more
The key is that its ability is much worse than either ability would be individually both destroying a land and dealing two damage a turn would be broken, but you get their choice of it, and its a choice they get to make every turn, so its not as broken as it might appear initially but still strong
Proxies are just printed playtest versions of cards that help you try out new deck ideas before you spend money on actual cards