This is because most of the cards that Painters Servant needs to go infinite are only Legacy legal
Aside from Krydle and Volo, which Ive already done deck techs on, you can build a forced combat deck with Karazikar, the Eye Tyrant
Scion of Oona At worst, this is a fairly standard lord with a slight downside (hexproof would be a vast improvement over shroud), but at best, this is the card that can mean the difference between every creature you control getting themselves killed, or doing the killing themselves
Its an important distinction to make, because if a mechanic is not inherently broken in all cases (and very few are) then you can make the case for a new set figuring out how to implement them in a way which avoids the pitfalls of previous overpowered designs
If you'd also like to damage opponents while sweeping the board, classics like Earthquake, [/card]Rolling Earthquake[/card], and Fault Line have been around for decades