Your opponents will often shift aggro to whoever is in control of the Crown, rather than whoever brought the Crown to the table
As is, though, it was banned in Commander in 2017 and then effectively axed in Legacy when Deathrite Shaman was banned earlier this year (2018)
Q: How long ago did these conversations start
The team then knew they had to get these cards right, and so they did
However, we can trace its approximate origins back to this card: To my knowledge, Core Set 2015 's Goblin KaboomistGoblin Kaboomist is the first card to create expendable, noncreature artifact tokens with a minimal effect on the game (this is the part where commenters slay me with an obscure card from Homelands )
An Introduction to Premodern Ben introduces us to Premodern: A 1v1, 60-card format spanning from Fourth Edition through Scourge that recreates 1995 - 2003 Magic without Power Nine or original Duals