TL;DR: Dont buy this card unless you know the campaign and have a good plan for how to use it.

The Tindalos version of the Archive of Conduits is one of the two researched conduits that target enemies with their leylines, the other being the Aldebaran conduit. Let's have a closer look at this card, which I have dubbed "put a leash on your fighter" (melody: "Toss a coin to your Witcher"):

The conduits are different yet all themed around leylines and movement. The Tindalos conduit let you put a leyline on a non-elite enemy as a action and teleport a party member to that monster as a action. If you used the regular action, you may remove the leyline to deal one damage to the tagged enemy. Or you can leave the leyline and just keep teleporting your poor friends into the clutches of an angry murder bird.

The Good

• You can more safely split the party and still have a fighter on tap. A (non-elite) monster spawned on the mystic? One leyline, one action, POP, the fighter is there to help. You can also gather the team around an (non-elite) enemy.
• Test less damage is always great. Good for zapping annoying aloof 1 hit point avian fiends or doomy cultists. Or to simply reduce that 3 hit points enemy to something that can be killed with a single slash from a 2-damage weapon.
• It's a great way to counter enemies that spawn far away from investigators. That's a small subset of enemies, but cultists often like to plot in peace. Better hope they spawn on a revealed location and not inside the train engine on the other side of the map...
• You, the seeker, can kill off a baddie simply by ramming an investigator into it multiple times. It's not the best use of an expensive asset and your entire turn, but it's fun!

The Bad

• This card is less useful for the Seeker paying for it. Let's say something nasty spawns on you, and you want to teleport in a buddy. You'll need to place a leyline on that enemy, activate the teleport action, take an attack of opportunity and, voila, here's your bodyguard. But the enemy is still there, up in your face you and it won’t go away until the fighter can kill it on their turn.
• Too conditional to be used as a way of transport. There are a few possibilities (leaving an evaded non-hunter enemy alive close to the temple exit), but those are often clunky.

The Ugly

• Non-elite enemies and revealed locations only. That's harsh, especially the non-elite clause. There are scenarios where this card has very few, even no decent targets. To be fair, there's scenarios where the card is great too, but even more where enemies will spawn on unrevealed locations, the map is small, the group is travelling together or where you're running away from monsters - not toward them.

In summary the Tindalos Conduit is awful in some campaigns and kinda okay in other. If you can make the teleport work for you, saving movement actions is so valuable that even this card can shine. It's better in larger groups and just plain bad in solo, better on larger maps but often redundant on small maps. A Researched 4 xp, 4 resources asset should be more universally useful than this - yet here we are.

Seems like Leo Anderson's ability to play an ally at the beginning of the turn is not lost since it is a reaction to the start of a turn. So with Geared up and Leo you could play an ally plus up to 4 items.

This card may give much more actions to hammer at the enemy than you thought at first glance, when you think about the sequence of exhaustion and ready :

• Round 1: Investigation Phase : Place Snare Trap and end the turn.
• Round 1 : Enemy Phase : Nearby Hunter enemy moves in and enters the trapped location. You will not be attacked since it exhausts after Snare Trap changed from attaching to the location, to be attached on the enemy card.
• Round 1 : Upkeep Phase : It cannot ready and Snare Trap is discarded instead. Supposed that if this card does not have "Instead," in the 2nd Forced text, it would still be useful as you have already benefit from escaping one Enemy Phase. (Similar to Hiding Spot in term of its longevity.)
• Round 2 : Investigation Phase : You have got an enemy in rare state which it is exhausted even before you do anything, and likely you or your team is already there to pump actions to it with Retaliate disabled. Normally to fight the enemy you would have to spend an action to move in first, so you save both move and evade actions.
• Round 2 : Enemy Phase : It still can't do anything, since exhaustion refreshes in the upcoming Upkeep Phase. If you cannot defeat it in 3 actions of Round 2 and decided to stay, you are still not receiving any damage. You can decide to leave in this round to not get the engagement.
• Round 2 : Upkeep Phase : Now it readies and you choose the engagement.
• Round 3 : You still can pump actions to finish it off, this time with Retaliate on.

You can get more attacks in Round 1, if one player is already engaging and the other player happened to draw Snare Trap. The other player can go first and put down Snare Trap nearby, then the engaged player maybe attack it a few times and sacrifice 1 AoO to move and drag it causing it to "enter" the location with Snare Trap.

The requires only discovering, it is independent from the +2 boost which requires a real investigation. Therefore it greatly upgrades testless clue such as Working a Hunch, Drawn to the Flame, Gravedigger's Shovel.

Dropping a clue from 1 to 0 with e.g. Forewarned, Dr. William T. Maleson maybe virtually free if you can pick it back up together with the other clue you are looking to get anyway.

Though an official ruling of Taboo is that you cannot partially follow Taboo, per an investigator :

Investigators are not forced to adhere to the restrictions on this list, but if an investigator chooses to do so, they must do so in full (an investigator cannot pick and choose which restrictions to use).

The reasoning behind this card getting +3 Chained is that :

We’ve also taken the opportunity to chain everyone’s favorite Eschatologist, David Renfield (+3 experience); the reasoning behind this change is in anticipation of many of the new cards coming in The Scarlet Keys Investigator Expansion, which are likely to propel this already popular powerful card to new levels of power.

So I think it is quite fair if a player is selectively following Taboo for something like Dr. Milan Christopher, but not David Renfield if you don't have any Scarlet Keys cards in your deck, if you are just looking to play with doom the old school way. (Perhaps for Daisy Walker deck that could include both.)