when you discard a card draw a card mtg Rules Text: discard, two, cards, 244 cards Thirst for Knowledge MTG -

It's not your only creature that puts up a good ground defense, but it's probably the best one

Esior provides protection and evasion in the command zone, while Ardenn gives you utility and cost reduction by effectively removing equip costs

I probably dont need to explain why discarding cards to draw cards is the best way to take advantage of whenever you discard triggers, but Id argue its so good and central to the plan that you should basically consider whenever you draw effects to belong in the discard archetype as well

If there were fewer, I could maybe maintain a deck for each, but as someone who might play cEDH, Old School, Premodern, Legacy, Modern, Pioneer, Standard, Pauper, and even Vintage, its just too much to keep a tournament ready deck for anything I might want to play