The black/purple LV7 Dexmon has what it takes to become the next anti-meta card.
His first effect reduces his play cost by -3 for each Digimon and tamer that your opponent has, a very straightforward effect that punishes tamer-centric decks such as the Zoe hybrid and the Tommy hybrid, which are easily the current tier-1s. To put this into perspective, Dexmon would cost only 2 to play when your opponent has something like 4 tamers and 2 Digimons.
His second effect not only de-digivolves all of your opponent's Digimons by 1 level, but also deletes all that is LV4 and lower. In other words, playing 2 Dexmons consecutively in a turn will clear the opponent's board of LV6 Digimons, assuming they digivolved normally in a LV4-LV5-LV6 sequence (again, punishing the current Zoe and Tommy hybrids). This effect is also highly effective against Armor Digimons.
His third effect punishes the opponent when he is not taken down during their turn, by deleting all of your opponent's Digimons with the lowest play cost. In other words, your opponent is forced to play some sacrificial Digimon before the end of their turn in order to protect their better Digimons, and this becomes more obnoxious the more Dexmons you have in play.