Like most Magic: The Gathering cards, the value of Armageddon depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Pro Tour Collector Set)
It lends itself to a completely unique mono-white eldrazi deck, which lets you play the normal heavy hitters plus white all-stars and game changers like Smothering Tithe and Teferi's Protection
Charizard was always going to lead the pack in terms of value, and that tiny little first edition stamp adds that extra level of rarity too
I mainly do Magic and its accessories like playmat[s]
And before that addition, Liliana of the Dark Realms was there to make sure I hit all my land drops, add to the combat damage win condition, and promise big mana that the deck thirsts for if unanswered
You get lots of reactive plays, but its hard to build a proactive gameplan when most of your cards dont do much until turn three and beyond