I used my collection of random cards, which probably has a low rate of foils for un-sleeved cards, and I used my decks for sleeved cards which probably have a high rate of foils
In this game, she uses an Aqua deck
Forwardme's consolidation service is built for exactly this purpose
More often than not, you destroy monsters via effects rather than battle
(You cannot halve the same damage twice this way.) While you control a Link Monster, monsters your opponent controls cannot target monsters you control for attacks, except this one, also your opponent cannot target monsters you control with card effects, except this one
It has a pretty good effect, and what had everyone shocked was a small detail in its reminder text: the inclusion of battle among the other card types