By reducing the number of cards a deck can use, Jegantha restricts the diversity of options available, which has ultimately led to its ban in Pioneer
Can go kind of nuts with things like mass Treasure creation, looping artifacts, or Food and other sorts of tokens
The ability to make all of my 0/0 artifact creatures default to 4/4 with flying is huge and I see it as the Overrun effect the deck needs to close out games out of nowhere
Gandalf the Grey Every instant or sorcery you cast lets Gandalf the Grey pick a new effect, whether that means tapping a creature, dealing damage, copying a spell, or bouncing itself to stay safe, giving it flexibility that shines in longer games
At 49 characters, it became the card with the longest type line in Magic history