Sympathy

You will lose the ability to cast spells normally if you're DM chooses this homebrew, so for spellcasters (especially the wizard) this is a must have. 

Some may believe magic to be some hobo waving his hands and chanting "wibildiboo, I am now invisible" and then you're pockets suddenly lighter, no, it is a philosophy, a science, or a gospel, or a random pile of poo in the woods that is somehow magical.

Rules Beyond The Spell: With this homebrew, you can basically chuck all you're spell knowledge out the window. Without this spell, you cannot cast ANY spell, that goes for cantrips too. This also creates a cool system of sleuthing around for you non-casters. You can now trace material connections, if you have passed the proper skill check (DC and skill is DM's preference, again) you can trace (almost) anything back to where it came from (in a material sense: coins from gold bars, laughter from a child, ect.) and find other "parts from a whole." Part of the philosophy of casting is under standing one part came from a whole, ideas from a mind, notes from a string, gods from a pantheon and leaves from a tree. 

The Spell: For this spell to work you must have someone or something with a personal or material (Rules Beyond The Spell) connection to you're target. You must be touching the item or person (yes it may be you) to mend the two together, which means you may cast cantrip (and cantrip only) on them. Note that in order to cast a spell a them at this level is that either the linked being (on either side) cast the cantrip on them no materials needed, or have a physical imitation of the cantrip towards the item or person (ie, light it on fire for fire damage spells, cold water for cold spells, paint it for illusion spells). if you do cast a spell, you will have to do a roll a spell DC of 12, and if you are using a physical imitation, the item or person will suffer from the spell too (from having the physical imitation) and the target takes half (rounded down) the affect if it is numerical, that is if the fail the AC roll.

At Higher Levels: The level of the spell you cast this at is you're max for spell levels on that item or person, but 1st level spell slot or higher lose the ability for one end to simply will a spell into existence, but rather you are required to have a physical imitation, with depend which level the spells you have casted with it, will be increasing in severity (ie, simply covering a coin grants invisibility, but hiding it grants greater invisibility).

Side Notes: Spells do count as a physical imitation, so you can chain together armies. NPC's will (hopefully) have the same exact homebrew, so expect goofy wizards to be goofier. This is supposed to to be a bit gritty, but also forces min maxing players to actually interact with the world. if the item or person that is receiving the physical imitation passes the AC roll, the effect carries on to the target.