The deck itself is generally a pretty standard Yellow Wargreymon list, however there are a couple cards that I would like to point out and highlight that may be a bit less conventional.
3x Patamon Promo
I played this card over recovery Salamon because it gives instant recovery, instead of needing to attack and delete itself for the heal. Patamon's effect is very restrictive (only recover on 0 or 1 securty) but you can always find scenarios to make it live.
When you swing with WarGreymon with BT3 Angewomon inherit at 2 security, you can resolve Wargrey first, take a security to restand, and then resolve Angewomon to play Patamon and heal one.
Green OTK will get you down to very low security, usually 0, but can't kill you until the next turn. On your turn you can resolve two Patamons and go back up to 2 security.
Worse case scenario, it is still a Rookie that you can digivolve over an egg for free (unlike Lucemon) which is why there is a higher ratio of Patamons to Lucemons in my list.
2x EDEN's Javelin
In general, Yellow's security is very weak and adding EDEN's aims to help that issue.
Without EDEN's, you have 0 cards that can defend from a jamming attack, so things like GranKuwagamon (after bursting promo Palmon), Beowolfmon, Imperialdramon, Veemon, etc. can attack with no reservations at all.
Late game this card is very strong after you have built up a big hand through Upamon effects and simply drawing and digivolving. It is not uncommon to get 11k EDEN's to kill off common boss monsters like WarGreymon, GranKuwagamon, or Lilithmon.
3-2-2 Level 6 line
I wanted more level 6s that I can play with initiative, so I cut WarGreymon down to 3, and added 4 other level 6s that I have no problem with playing first. This BT4 format is a game of hiding in security until you can punish your opponent, however, with 2 SlashAngemon and 2 Magnadramon, you have cards you can play and gain instant value, so it is less consequential when they are dealt with.
After your opponent uses their resources to clear your Slash or Magnadramon, you can then play your WarGreymons and Valdur Arms to punish their play and maintain the upper hand.