Tom and Jerry

Decklist:

Starter - Flask Marmoset

4x Ruler Chameleon (Crit) - When it gets retired, you can counterblast 1, search your deck for another one, and add it to your hand. This only works if you have a Great Nature vanguard, so this is a viable tactic for a grade 1/2 rush if you didn't secure Libra as a ride.
4x Triangle Cobra (Crit)
4x Psychic Bird (Crit) - Move to soul, draw.
4x Oracle Guardian, Nike (Crit)

Grade 1's

4x Silver Wolf (Makes tom 20k with one dope)
4x Coiling Duckbill (Draw when a unit is retired, 23k with two dopes and Tom)
3x Tank Mouse (Tap him, give a unit +4k.  You can call over him to play a booster for Binoculus for a push or leave him behind a VG Cookie for 21k.)
2x Chocolate (Perfect Guard.  Sucks if you have to ride it, but still very easy to get late game since you mill through your deck very quickly.)
1x Tic-Toc Flamingo (Unflips a damage since almost everything is CB2.  A single tech because we don't really need it, but it's still better to have around than an excess of Tank Mouse's 6k body.)

Grade 2's

4x Binoculus Tiger (When it attacks a VG, give 4k to the unit boosting Tom.  If you miss Tom, he can dope his own booster, which if it's 8k, can make 21k.  All kinds of combo play here.)
4x Silent Tom (Can't be guarded by grade 0's)
3x Maiden of Libra (CB2, draw on hit)

Grade 3's

4x CEO Amaterasu (Scries top card, makes it a 70% chance to crit.  Thins deck.  Potential megablast.  Makes 21k with the 7k units, and you typically want to call Coiling behind her anyway.)
4x Battle Sister, Cookie (CB2, draw 2, discard 1.  Synergizes greatly with the fast paced draw and mill of the deck to get out all of your Toms.  Swings for 21k with Tank Mouse and 23k with Silver Wolf.)

Tom and Jerry is a Great Nature and Oracle Think Tank mixed deck that focuses on using the power doping of Great Nature to increase the power of a booster behind Silent Tom while having an Oracle Think Tank vanguard, so that he becomes incredibly difficult to guard against, requiring either 3 or more cards, or a perfect guard.  The Vanguards of the deck, Cookie and CEO also swing for over 21k pretty easily, so this makes opponents want to drop multiple nulls per turn, but instead they have to also 2 to pass your Vanguard with grade 0's, which really burns out their resources and can open up 2-to-pass victories in a lot of cases.  The deck also uses its counterblasts on Libra and Cookie to draw, or if the game goes on for a while, CEO to Megablast.  Flask Marmoset is also an option.  Since we have the OTT card draw, deck thinning, and trigger scrying to go with Great Nature's unflipping (Tic-Toc), drawing (Duckbill), and doping (Tank Mouse, Binoculus), the deck lets you burn through itself to consistently get out what you need.  Typically, by time they can kill a Tom, I'll have another one ready to play.  Additionally, with 16 criticals and Amaterasu scrying the top card for them, we get a 70% chance to crit.  That's right, Tom gets even deadlier.

Link to Youtube video of the deck.