The challenge is that these are 25-plus year old cards printed on vintage card stock that was not designed for long-term preservation, and finding copies in truly excellent condition requires patience, knowledge, and a willingness to pay condition-appropriate premiums
We don't recommend crafting niche URs just for this event, but you may have already opened a copy or two that's just collecting dust in your digital binder
Formula Synchron There are plenty of powerful effects that trigger on synchro summon for example, Black Rose Dragon blows up the entire field when its synchro summoned, and Trishula Dragon of the Ice Barrier banishes 3 of your opponents cards
Partner with Frodo, Adventurous Hobbit (When this creature enters the battlefield, target player may put Frodo into their hand from their library, then shuffle.) At the beginning of combat on your turn, create a Food token