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Does the type of item you apply the Replicate Magic item infusion matter? I mean, if I infuse the replica of Bag of Holding in a dagger, does the dagger turn into a Bag of Holding, or it stays like a dagger with the same effects?

The artificer's Infuse Item feature states, under the "Infusing an Item" subheader (E:RftLW, p. 57):

Whenever you finish a long rest, you can touch a nonmagical object and imbue it with one of your artificer infusions, turning it into a magic item. An infusion works on only certain kinds of objects, as specified in the infusion's description. If the item requires attunement, you can attune yourself to it the instant you infuse the item.

The Replicate Magic Item infusion states (E:RftLW, p. 63):

Using this infusion, you replicate a particular magic item. You can learn this infusion multiple times; each time you do so, choose a magic item that you can make with it, picking from the Replicable Items tables below. A table's title tells you the level you must be in the class to choose an item from the table.

If yes, can the common armour variant magic items found in Xanathar's Guide to Everything, such as Cast-Off Armor, be created? Can I use this to get a set of Half Plate Armor from this infusion?

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To infuse an item, you need the nonmagical version of that item.

The artificer's Infuse Item feature states (E:RftLW, p. 57; emphasis mine):

At 2nd level, you gain the ability to imbue mundane items with certain magical infusions. [...] Whenever you finish a long rest, you can touch a non-magical object and imbue it with one of your artificer infusions, turning it into a magic item. An infusion works on only certain kinds of objects, as specified in the infusion’s description.

The Artificer Infusions section at the end of the class description states (E:RftLW, p. 61; emphasis mine):

The description of each of the following infusions details the type of item that can receive it, along with whether the resulting magic item requires attunement.

And finally, the Replicate Magic Item infusion states (E:RftLW, p. 63; emphasis mine):

In the tables, an item’s entry tells you whether the item requires attunement. See the item’s description in the Dungeon Master’s Guide for more information about it, including the type of object required for its making.

If you have Xanathar’s Guide to Everything, you can choose from among the common magic items in that book when you pick a magic item you can replicate with this infusion.

Each of these portions I've bolded make it clear that you need a nonmagical version of the item to infuse, whether you're using Replicate Magic Item or one of the other artificer infusions.

In the case of your example, the description of cast-off armor states:

Armor (light, medium, or heavy), common

Thus, you need a nonmagical version of whatever kind of armor you want to turn into cast-off armor. If you want cast-off half plate armor, you need a nonmagical set of half plate armor to imbue with that infusion. The Replicate Magic Item infusion doesn't create a magic item from thing air - it gives you the ability to imbue a certain mundane version of that item with the necessary magic to function as that magic item.

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No. The infusion simply adds traits to an item as per what the infusion itself does. The item it must be applied to is a normal version of that item. So a bag of holding could be made out of a regular belt pouch, a +1 dagger out of a normal dagger, and cast-off chain mail out of normal chain mail. I can see where the question here is coming from due to a lack of clarification in the rules, but based on the wording we can infer that it is intended to mean that any infusion simply adds properties to an item instead of changing the item into something completely different.

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    \$\begingroup\$ While it is correct, can you support your answer by citing the relevant rules? \$\endgroup\$ – V2Blast Dec 8 '19 at 3:29

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