There's a memory component here, but it's no harder to track than, say, the Day/Night cycle while there are no Daybound or Nightbound creatures in play
You can only use this effect of "Heavy Cavalry of the Indestructible Insects" once per turn
Below you'll find all of the cards in the 'Crimson Blaze Museum 2' Secret Mission: Mega Venusaur ex #83 (Rainbow / Two Gold Star) Mega Blastoise ex #84 (Rainbow / Two Gold Star) Mega Lopunny ex #85 (Rainbow / Two Gold Star) Mega Steelix ex #86 (Rainbow / Two Gold Star) Rewards: 36 Wonder Hourglasses, 12 Pack Hourglasses and 10 Shop Tickets
As for Vivis second effect, you may rest Vivi to give one of the opponents Characters a -2,000 Power reduction, and you can give the Rush keyword to a Character that doesnt have the When Attacking effect
And thanks to in-set foil upgrades, you can get foil versions of all the sets new cards, right away