In fact, the Aerith Gainsborough card also references this, as she gains +1/+1 counter every time the player gains life, and these can be distributed to Legendary Creatures when shes destroyed
Double this double that, why not go double combat
It'd be the 'approachable' trading card game, one that was still tactical but didn't scare newcomers away with reams of special terms you need a glossary to understand
Additionally, Lighting, Army of One has Lifelink, Trample, First Strike, and Staggering, which cause other damaging effects to double against an opponent or their permanents for one turn after she attacks
This was well before release, so its clear for at least this card they were aware and had internally changed the image
Initially, the legendary rule applied to the entire battlefield and made it possible to force your opponent to sacrifice a legendary that you also had, but this is no longer the case, since the legend rule would only make you choose your own planeswalker to sacrifice