There ARE other drakes besides infernal indeed, but

Can we please address the fact that ocean becomes near useless after the 10 minute mark?

Yes the OG ocean drake was most definitely overpowered and kind of whacky with how its healing mechanic operated, but this new one is useless outside of laning phase (aka ocean will only be somewhat worth of an objective if its the first spawn and you can take it relatively early).

Outside of lane the ocean serves no purpose other than to increase burn from when elder eventually comes around.

This was the release ocean drake buff:

"Every 18 / 12 / 6 seconds, restores 10% of missing health and 10% of missing mana."

Then came patch 6.10

"Ocean Drake Now restores health and mana only when out of combat with champions and towers.

Regeneration effects often go unnoticed by their owners, but the Ocean Drake buff is large and spiky enough that players feel the individual ticks. The occasional lucky tick right before a killing blow, however, was adding more frustration than gameplay and often leaving players wondering if their damage hadn’t gone through. Tying the regen to stay out-of-combat allows more counterplay to opponents, allowing them to feel less like they’re fighting a rising tide. Of regeneration. UPDATEDMark of the Ocean Drake SEA GOD’S CLAIM Restores 4/8/12% of your missing health and mana every 8 seconds if not damaged by a champion or tower in the last 5 seconds"

The heal is stronger but the out of combat essentially forces it to be relevant only in lane phase where occasional trades are made. The heal is still nowhere near as strong as something like a warmogs (as it should never be) but its too weak to matter in teamfight phases where essentially the winner of the fight tends to come out massively ahead or ahead enough to shove the defending team into their base.

The reason people take infernal drake so seriously is because it's ALWAYS useful.

It's useful in trades. It's useful in teamfight phase. Hell it's useful in objective control even if not to the degree that mountain drake is. It's always damn useful, it is NEVER useless.

Cloud drake used to operate only out of combat like ocean did. What happened? It was near useless. Riot changed it so now it's ALWAYS useful. How? They struck a middle ground by allowing cloud to activate even during combat, but getting its full effects only when out of combat.

Why can't this be done with ocean drake? If it's too strong out of combat then it can completely warp lane phase mechanics while still being useless as hell outside of lane (as it is right now where if a team gets an early first spawn ocean mana becomes literally irrelevant for most champions). If it's too strong in combat then it completely warps the game all the time (old ocean drake where in a fight someone can randomly gain a huge chunk of health and mana out of nowhere).

What if we weakened the heal in combat but allowed it to still be active in combat?

what if in combat it went from 4/8/12% missing heal and mana restore to 1/2/3% missing heal and mana restore? And then to compensate for it's added strength (if it even needs any compensation at its current power level as a drake buff) you could always make the out of heal 3/6/9% so it operates on the EXACT same calculations as the cloud drake (which gains 300% efficacy when out of combat).