Aminatou, the Fateshifter In Esper colors, which are strong for blink strategies, you can fill your deck with cards that have powerful ETB triggers and add value boosters like Panharmonicon
A part of me thinks it deserves to remain the top Magic card simply because it wasnt designed to be a one-of-a-kind card, which almost feels like too much artificial scarcity added into the mix
Ill go over a few examples of why some specific cards have been banned: Treasure Cruise + Dig Through Time [mtg_card]Treasure Cruise[/mtg_card] and [mtg_card]Dig Through Time[/mtg_card] are examples of cards that were individually too powerful for Modern (amongst other formats)
If a card would be put into your graveyard from anywhere, exile it instead
Though he is tiny (especially compared with some of the other Cosmos monsters), he scampers with unbelievable speed along the World Tree to carry messages between realms
(Or even reach if you just want to block flyers)