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If a card(s) leaves the Extra Deck (except during the Damage Step): You can target 1 "Fallen of Albaz", or 1 monster that mentions it, in your GY, except "Guiding Quem, the Virtuous"

Its particularly handy if youve got a strategy up your sleeve that requires multiple cards to be played over multiple phases of your turn, or if youre a less experienced player like I am

The standard play there was to have Luxray use Bright Look to bring up whatever the LuxChomp player wanted and then Garchomp to pew pew whatever it so chooses

No doubt theyre incredibly powerful, allowing you to cheat big creatures into play and ramp, but there are plenty of commanders that let you do this already