The cheapness of the deck and the mana dorks made Armageddon too good to turn down
That being said, making an army gain +1/+1 and lifelink, or tucking a big tough creature can be very relevant when behind, which you so often are in EDH
Since 2011, there has been a TCG Happy Meal crossover every year except in 2020
However, two different Planeswalker cards depicting the same character are totally okay you can have both Gideon, Ally of Zendikar and Gideon of the Trials on your side of the battlefield
While the stock, budget, and mid-cost version of this deck all relied on King of Hearts to lock down exerted characters, the sad truth is that King of Hearts is a weak, over-priced, and under-statted character
The other three cards were part of a futureshifted vertical cycle