With the ability to copy attacks from Pokmon that have the acronym Fusion Strike and still being able to reuse the Power Tablet FST 236 that increase Mew's damage, easily exceeding 300 damage, which is a headache for players
And you only have to get to a total of 20 creatures, lands, and artifacts once to win - at that point you never have to let your opponent take another turn, and can just keep casting spells and generating tokens, freeing up more and more of your board to attack
Rally the Ancestors can be used in a similar way, but Faiths Reward goes a step further by reanimating noncreature permanents the kind of power which got Second Sunrise banned in Modern for enabling combo decks like Eggs and KCI
In the Sword & Shield era especially, the Lost Zone cards became apart of one of the most dominating archetypes and Lost Origin has almost every piece these used
Both of these cards feature the acclaimed work of Final Fantasy series' artists Yoshitaka Amano and Tetsuya Nomura