The short answer is that Lightning Bolt became that standard
Wizards' first attempt at a legendary bear was Goreclaw, Terror of Qal Sisma, a great standalone card that doesn't really incentivize you to build a deck full of Grizzly Bears and all the underwhelming variants
If youre looking to upgrade your blue/white control decks or are trying to hunt down all the Japanese Alt-Art cards, Teferi will make a nice addition to your collection
Being self contained, it grows itself and gives itself evasion, protection, and eventually becomes a hard to stop threat
For example, a Pokmon with a Float Stone attached in the regular trading card game has no retreat cost
Any communication must be verbal, in a language both teams can understand and loud enough for the other team to hear