You are overpaying by a ton for that extra card when you use Think Twice
Triggering Minn every single turn requires slightly different enablers to venturing as Sefris, but otherwise, the philosophy is similar and the payoff equally big
For each of those creatures, create a token thats a copy of that creature
For one black mana, you sacrifice a creature or land and draw a card
(Xyz Materials on that monster also become Xyz Materials on this card.) When this card is Xyz summoned, you may Special Summon 1 level 5 or higher LIGHT monster from your deck to your side of the field
Clearing three red cards and then another three red cards doesn't double the attack damage as you might think, whereas clearing three red cards then another three cards of a different color might deal a lot more damage since it triggers another Digimon's attack