Okay. So here's what I managed to come up with.
Fruits, Nuts, & Flakes
Grade 0 - 17
1x Shield Seed Squire
4x Dancing Sunflower
4x Chesnut Bullet
4x Sweet Honey
4x Watering Elf (Moves to soul to give a unit +3k, useful for the decks low power curve, but drops a 10k shield)
Grade 1 - 14
4x Blade Seed Squire (At worst, 7k booster. At best, fetches an intercepter for an extra 5k shield)
4x Maiden of Blossom Rain (Staple perfect guard)
2x Boone Banana (Toss behind Iris Knight when possible, returns to hand after a successful boost, used to increase shield and commit less to the field; part of the challenge)
2x Caramel Popcorn (7k booster with no real use; part of the challenge)
2x Fruits Basket Elf (6k booster, toss behind a rear-guard and attack a rear-guard with it; the opponent is unable to guard from hand, allowing you to eliminate pesky attackers with relative ease; part of the challenge)
Grade 2 - 11
3x Hey Yo Pineapple (11k attacker if the rear-guard is full; part of the challenge)
3x Iris Knight (Necessary to go with 6k boosters)
3x Knight of Young Leaves, Gene (at worst, 9k attacker. At best, fetches a grade 3 10k to go with the 6ks)
2x Poison Mushroom (At best, 5k shield. At worst, you have to call it; toss Fruits Basket Elf behind it, use Watering Elf or Exploding Tomato to make it a 10k for the turn, and your opponent can't guard from hand whatever you attack, use it to get a free card; can't damage your opponent)
Grade 3 - 8
4x Maiden of Trailing Rose (Grade 3 vanguard. Use to fill up your rear-guard for Pineapple's or Mushroom's skill.)
2x Knight of Harvest, Gene (10k attacker to go with our 6k boosters, at best fetches 2 intercepters for an extra 10k shield)
2x Exploding Tomato (9k attacker that gives +3k to another unit. Useful to increase the low power units or to help with hitting Hamburger-Time; part of the challenge)
***Notes: The deck focuses around gaining advantage from the deck, superior calling as often as possible. It shores up low power levels with an 11k vanguard for defense and a few power gain skills. Fruits Basket Elf helps ensure that you can take out a rear-guard with relative ease, allowing you to net a +1. The deck attempts to make the best columns possible barring Fruits Basket Elf, who doesn't need to form a 16k column because of its skill. It aims towards the defensive, attempting to maintain relative advantage over your opponent.***