Despite how many players view Ivern as a slow, scaling jungler that often seemigly does very little, he can be one of the most oppressive mid laners in the game. His early levels can feel a little lackluster, but he is nye impossible difficult to move in lane. His Triggerseed shield makes him nearly impossible to poke out in lane, while his Brushmaker autos make it so he can easily chunk out an opponent with just a few auto attacks, and makes it easy to last hit. Daisy! is one of the single most broken abilties in the early-mid game. She might as well count as a sixth champion for the team with how much damage and crowd control she can provide when combined with Triggerseed.

While Ivern is great on his own in lane, his real strength comes when working in unison with his allies. Pairing an early game jungler that can follow up on his CC and/or help him apply slows via Triggerseed can often net a lot of early kills that normally would not be possible. Ivern can also get push in a lot of lanes on his own by simply throwing Daisy! into the center of the wave to pop 2 Triggerseeds, and autoing down the minions the rest of the way. This can then be used to allow you to roam freely with your jungler and apply pressure with them in lanes the enemy jungle.

One trick I find useful for the early game after level 6 is using Brushmaker near one of the sides. There are a few positions you can place brushes, that if your opponent is not far enough up the brush is invisible to them and can actually provide a spot of what I will call "false vision," or a spot that looks like your opponent should be able to see, but actually cannot. You can use this to your advantage in combination with Daisy! and Triggerseed to get a jump on them. Daisy! has 25% increased movement speed when first spawned, so this combination of Ivern's abilities can sometimes make it so they cannot react in time to Daisy! running at them and makes the Triggerseed undodgeable. This could easily set up a pick attempt with your jungler, or even in some matchups simply result in a solo kill.

Here are two short videos showing this mechanic in Practice Tool from each PoV:


As can be seen in the videos above, spawning Daisy! in the brush and using Triggerseed on her as late as possible, allows her to reach her opponent much quicker than they are realistically able to react to her. This can be very substantial in both mid lane and in jungle when trying to set up a pick with your jungler or laner.

Also as promised earlier, here is a chart showing how Ivern's effective health scales with each of his items at all levels, aside from Seeker's Armguard as this is one of the worst items in the game to sit on, so I did not take the time to calculate it.

While Ivern has a great laning phase, his real strength comes in the mid game. After the completion of Moonstone Renewer and/or Redemption, this champion is a teamfight and skirmishing fiend. He can supply a disguting amount of healing and shielding to his teammates, while still being able to supply tons of base damage via Daisy! and Brushmaker autos, while having insane amounts of utility with Triggerseed slows and Rootcaller. Rootcaller is one of the best abilities in the game at catching out opponents, as it not only roots, but allows his entire team to dash in range of the target, even if they do not have a dash of their own. This pairs very well with champions like Darius, who while he may not have a dash of his own, is one of the best champions for catching opponents and making sure they have no way to escape before he inevitably kills them. However, while Ivern may be incredibly strong in the mid-game, be careful of your build when you have a double enchanter team composition. Quite often enchanters all like to build the same items, and this is no different for Ivern. Make sure to communicate with the other enchanter on your team to ensure you do not build the same items that do not stack.
If these items seem like a good fit for the given compositions and game state, make sure to communicate with any other enchanters on your team to figure out who will build which items. Generally, you should be building whichever ones are immediately important (i.e the enemy team has a surplus amount of healing and you will need Chemtech Putrifier ASAP), since you will generally be getting a lot more gold than them.

With certain team compositions and game states, it is not a bad idea to eventually build Spellthief's Edge. This item will allow your teammates that need more gold than you to take all the farm, without completely cutting you off from any sort of gold income (bar any kills or assists that come your way). Also when you eventually upgrade it into Frostfang and Shard of True Ice, you will be able to help your team with vision.

Late game is typically where a champion that has similar early power levels to Ivern would fall off. However, Ivern scales well simply due to the nature of his champion archetype. Enchanters generally tend to scale a lot better than many early-game focused champions. However, enchanters pair really well with a lot of early-game focused champions because many of them can actually scale well despite seeming to fall off normally, just by having an enchanter on their team to back them. Champions like Xin Zhao and Olaf are great examples of this, since they have very strong early-mid games, but normally fall off significantly come late game. But with an enchanter to back them up, it can provide just enough reenforcement to maintain their incredible early power levels during the late game, thus preventing them from becoming a dud champion.

While Ivern may not scale quite as well as champions like Sona or Soraka as a general rule, he can still compete and sometimes even be better depending on team compositions and game state. However, he typically trades off a bit of late game power for a much better early-mid game.