Like his name this deck ruin the fun
honestly this is going to be very long but i just make it short and use more important note instead. For first turn digivolved into agumon(whever version but i recommeded to use EX4 since it have draw effect that you might need so you can get 2 draw) then use training or digivolved into geogreymon(BT21 or EX4 don't choose other as you might need those when digivolved effect later) after that put it to field if you have greymon bt21 on play and rizegreymon on hand, play tamer to activate it effect then evolved into rizegreymon if it BT21 don't suspend your tamer yet instead use it effect then if you have no memory left attack it then since it suspended you will get 2 draw thanks to koromon and agumon ex4 if that card marcus BT13 use it effect to digivolved into shinegreymon(whenever version) but if it still your turn and you have 0 or more memory don't attack just yet instead make set up before you attack with that card like maybe you want to digivolved into rizegreymon x antibody to play another tamer and dp reduction or if have 3 or more digivolved into shinegreymon then use marcus bt13 to evolved into shinegreymon ruin mode. If you don't move your digi egg yet have any of those card just play searcher card like agumon(BT13 or BT16) or training
Those two shinegreymon(BT13 and BT21) are needed because it digivolution cost 3 and it help like shinegreymon bt13 will turn one of your marcus into digimon for free(but no rush) or BT21 if you wanted to suspended one of your marcus to quickly attack and evolved into ShineGreymon Ruin mode and quickly deleted it self so your opponent get -10000DP, i don't recommended to use this cause you also needed on your next turn so that opponent can't play digimon and force opponent to not move digi egg to battle area unless if your opponent playing royal knight, dark master or anything that this will highly needed.
Just becareful of tamer hate like Quartzmon and MoonMilleniummon they will break of your board easily