pokemon sun and moon charizard card GX (SV49/SV94) [Sun & Moon: Hidden Fates [Colorless][Colorless] Pokemon Sun & Moon Team

Legendary permanents are subject to whats called The Legend Rule. If you control two or more legendary permanents with the exact same name, you must choose one to keep and the rest are put into the graveyard

Its clearly bad Limited fodder

Real MTG cards have a distinct black border around the edges of the card back

The second reason is that the board state of Modern is a lot less X/1 centered like in Legacy, so W6 will have naturally less targets to kill

This came to shine in a recent game of EDH I played personally

The companions all have mono-color casting costs or are colorless, potentially adding a third color to your Commander deck as each of the Doctors has a dual-color casting cost