While Grand Master of Flowers isnt a particularly powerful or highly played card, nor is it worth much in its regular printing, the exclusivity of the card has certainly made a huge impact on its price
Putting together a deck revolving around a specific card or effect you like (and tweaking that deck over time as you find out what works and what doesn't) is strangely moreish
This is exacerbated when you interact with some cEDH decks that revolve around their commander, and a couple of removal spells can really ruin their day
If youre playing a lands-matter or landfall deck, you probably want to have more lands than you typically would
Azors Elocutors Azor's Elocutors is a way to win a game in a prison deck, filled with enchantments, Sphere of Safety, Ghostly Prison, and the like
In formats where the cards are still legal, its rare for games to last much beyond the first swing of an Annihilator creature