No, this effect places 1 of your opponent's Digimon with as high or lower a level as the number of cards in either your or their security stack at the bottom of their security stack, not the total number of cards
Using a single draft pick and a single slot in your deck on a card that can be both a cheap beater against control and a stonewall against aggro is a lot of value, even if its not the best cheap beater or the best midrange blocker
Its able to do both brainstorming and MadLibs in the same prompt response, and just a little bit of parsing is required to get out the final response
His card-draw engine is very good to keep your hand filled with things to donate to your opponents
So, as soon as youve got Serperior set up on your bench, Celebi can fire off a Powerful Bloom for a single energy
15 power and toughness for 7 mana can have a huge impact, especially considering the abilities these elemental creatures might have