Glad I could help. Like I said, it'd be maddening to give you the full summary of all you've missed in the game from S4 to S7. It's a lot of differences: Marksman Update, Mage Update, Assassin Update, a couple of reworks, Support Itemization Update, Jungle Update, No Mana Potions, Elemental Dragons, The Rift Herald nobody cares about, heck there were even turret lasers last season for inhib and nexus turrets which got removed this season. Anything else I missed, I'm sorry.
All of that has been met with increased flexibility such as the MF Support, which became a viable thing specifically into Zyra and later Malzahar due to the increased range of her Make It Rain (E) back from the Marksman Update. It was played by Samsung Galaxy's CoreJJ at Worlds last year (formerly Dignitas Bot Lane player moved to Support when moving back to Korea). Ever since, the idea behind it really clicked and was a common pickup for at least the first couple of weeks globally before Zyra and Malzahar both took some nerfs and the counterplay to MF became aware. Another one you wouldn't expect is Ziggs in the Bot Lane, primarily due to his Mage Update which provided his Satchel Charge (W) an ability to instantly execute turrets when low enough (something around 30%) making him a dangerous siege champion when ahead.
If it's not all too hard, I would give watching the last day of NA LCS regular split a go. All 4 matches today have playoff and/or relegation implications on the line. It's almost can't miss.