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What the title says.

Had two Swamps and two Forests untapped, no 1 mana spells in hand. Cast [[Expanded Anatomy]] and it tapped both Forests, even though I could cast [[Mage Duel]] after that.

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about 3 years ago - /u/WotC_BenFinkel - Direct link

Originally posted by mrbiggbrain

The autotapper is a backpack solver, probably with some kind of static state analysis involving costs. It just would be impossible of solving that situation. Most backpack algorithms are "Good Enough" variants since solving for a backpack is very hard, resource intensive, and the best answer is usually not that much better then an informed guess.

Imagine you hve a backpack and you are trying to figure out what can fit inside. Not only do the items have a size they have dimensions, and not only do they have dimensions they have weight, and not only do they have weight they have importance. Trying to determine the best items that can fit and how they do so as you can imagine is a massive undertaking.

That is what the autotapper does. It solves a large number of backpacks to see what combinations of items could work where the cast spell is part of that solution.

Now imagine if your tent got smaller when you put a blanket inside... that greatly complicates the issue because you can no longer create a permutation tree, you need to calculate each item on demand!

TL:DR; Basically, it's hard.

This is a great summary of the problem space autotap lives in. #wotc_staff