The Combo Enabler
Normally, combo decks tend to be extremely intricate, with lots of lines and plans. This is a completely different combo.
Treasure Hunt, at least when building this type of deck, demands it to be mostly lands. The intention is to cast it, preferably on turn 2, add lots of lands to the hand, either stopping when hitting another Treasure Hunt or card:Zombie Hunt.
There's one problem though. You can't cast it on turn two without Reliquary Tower in play. Otherwise you're gonna discard all the cards you added and have no fuel for Zombie Infestation. And since I mentioned the wincondition, if you have Zombie Infestation instead of Reliquary Tower, you can cast the Infestation turn 2 and cast Treasure Hunt on turn 3, then you proceed to dump your hand in order to make the army of zombies. Oh, I almost forgot. Thanks to the ratios of the combo cards, it's an acceptable play to cast Treasure Hunt on turn 3 BEFORE making the land drop. The reason is you can end up finding Reliquary Tower, in which case you can play it and not have to discard anything.
One important aspect to discuss is ratios. I mentioned basing this deck on SaffronOlive's video, in which he uses 4 copies of Treasure Hunt. I've also seen a few other lists using 4 copies. The issue with this is it increases the fizzle rate. Chaining Treasure Hunts together is good, but it's better to fill your hand and find your wincondition. The more copies of nonland cards you have the less chances you have of getting enough fuel. I chose 3 copies because it's enough to have it consistently in my opening hand without it making me lose turns having to cast another copy. Moreover, 1 or 2 copies is out of the picture. It's too risky to have such a low amount of copies. This deck is already weak to disruption as it. Having 1 or 2 copies just makes it completely dead against any form of disruption.
To reiterate what was said:
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It's obligatory to have it in your opening hand. So, mulligan aggressively.
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Don't cast it unless you have Reliquary Tower or Zombie Infestation in the field.
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I chose fo run only 3 copies, but 4 can be okay. However, never run 1 or 2, or you're asking to lose.
Sidenote: I know it seems weird talking like that about ratios and have Lutri, the Spellchaser in here. That's just for the memes, as I'll explain when I get to the otter. Just know these ratios have to do with a normal Treasure Hunt deck.