mtg card stand 3in1 Deck Box Sports Storage Box Fits 200+ Single Sleeved Card Deck Case for TCG CCG Cards with 4 Dividers 2 Toploaders preventing any risk of the stand and card toppling over Card Holder Stand

Return Dockside Extortionist to your hand, and then use two of the Treasure tokens you made to re-cast it and make a boatload of Treasures

Card not found (rare) is a new Card not found of sorts

I dont think you should play Key to the Archive only for its spellbook, but its not hard to find a deck that wants to make use of two extra mana of any combination of colors (and here it being any combination is important, because it allows you to cast off-color gold cards like Putrefy and Lightning Helix)

Where else will you get an emblem that counts any creature dying

In addition to the card's other abilities, it also has a card draw effect that activates after an opponent plays their second or more spell on their turn